The weirdest side effect

What’s the weirdest side effect of a medication that you have experienced?

My face got completely red (and hot like a sunburn) from the antibiotics I was given after one of my surgeries. My surgeon didn't believe me when I said it was from that and he thought I was mad about something. I took the same antibiotics about 6 months later and once again my face turned completely red, so I knew I was right.

I also had reaction on some antibiotics (some kind of ear infection), around 30 years ago. Much of my chest, face and upper arms was covered by red rash that had a weird rubbery surface. It didn't itch or feel anything, maybe a bit more numb than normal skin. I just looked like something out of Star Trek, lasted few days.