I stepped away to the restroom during my wedding, and as I was walking back to my seat, a waiter suddenly grabbed my arm and quietly warned me, “Don’t drink from your glass — your mother-in-law put something in it.” 
Because of that warning, I decided to switch our glasses. About half an hour later, something terrible happened. 
The reception hall was full of life. Music played softly, guests laughed and talked, and the clinking of glasses mixed with warm congratulations and toasts. Everything blended into a cheerful atmosphere. Standing beside my husband in the center of the room, I felt happier than ever.
My eyes drifted toward the main table. My mother sat there, and next to her was my mother-in-law. She looked flawless — wearing an elegant light-colored suit, her hair perfectly styled, and a calm, polite smile on her face. She chatted comfortably with the guests and occasionally raised her champagne glass.
At one point she noticed me looking at her and gently lifted her glass in my direction. I smiled back, although deep down I felt the familiar tension I often experienced around her.
A moment later I realized I needed to step out for a minute.
“I’ll be right back,” I told my husband.
“Just don’t be long,” he said with a smile. “We’re about to cut the cake.”
I walked across the hall, greeting guests along the way, and went to the restroom. After fixing my makeup and taking a quick breath, I headed back to the table.
As I approached my seat, a young waiter stopped me. His name tag said he was a trainee. Pretending to adjust the table setting, he leaned slightly closer and whispered so quietly that I almost didn’t hear him:
“Please… don’t tell anyone… but don’t drink from your glass.”
At first I was confused.
“My glass?” I asked.
He nodded quickly.
“The one at your seat. Please don’t drink it.”
Then he walked away immediately, as if he was afraid someone might notice him talking to me.
I stood there for a moment, staring at the champagne glass in front of my chair. It looked perfectly normal — golden liquid, tiny bubbles rising to the surface. But the waiter’s warning kept repeating in my mind.
“Don’t drink from your glass.”
I sat down and watched it quietly, feeling a growing sense of unease.
A few minutes later I stepped out into the service corridor and found the same waiter. At first he refused to talk, but when I threatened to call the manager, he nervously showed me a message on his phone.
The message was from my mother-in-law.
She had offered him money to add something to my drink. According to her message, it was just a “sedative” to calm my nerves during the wedding. The young waiter admitted that he agreed because he was afraid of losing his job.
When I heard that, a cold feeling spread through me. I returned to the reception hall quietly. No one suspected anything — the music was still playing, guests were laughing, and waiters continued bringing food to the tables.
I walked back to my seat, smiled politely, and discreetly switched my glass with my mother-in-law’s.
Then I picked up “my” glass, stood up, and said, “I’d like to make a toast.”
The room grew quiet. My mother-in-law watched me closely, a strange smile forming on her face. I raised my glass and took a small sip.
She lifted her own glass as well and calmly drank from it, still smiling at me.
But about half an hour later, something happened that I never expected. How could she do something like that to me?
The continuation of my story is in the first comment 
About thirty minutes after the toast, I noticed my mother-in-law behaving strangely. At first she began smiling oddly and quietly laughing to herself, even though no one had said anything funny. Guests exchanged puzzled looks, assuming she had simply had too much champagne.
Then she suddenly stood up.
“The music… what beautiful music…” she murmured.
But the orchestra wasn’t playing at all.
Slowly, she started spinning around in the middle of the hall. At first it almost seemed like a joke, but soon it became obvious that something was wrong.
She laughed louder and began waving her arms as if she were trying to catch something in the air.
“Butterflies… can you see them?” she said excitedly, reaching out in front of her face.
Guests began whispering. Some thought she might be feeling sick. But it only got worse.
She walked up to one of the guests and suddenly hugged him.
“My son, you’re so funny today!” she said, even though it was clearly a stranger.
Then she started dancing alone, spinning, laughing loudly, and grabbing people around her like they were old friends.
All eyes in the room were now on her.
And suddenly it hit me.
She hadn’t put a sedative in my drink at all — it was hallucinogens. She wanted it to be me standing in the middle of the room, talking to imaginary things and humiliating myself in front of all the guests.
