What's the weirdest most unexplainable thing that ever happened to you???

In 2016 I had an appointment to have an eye exam, I remember it was fall , I had really good sleep and I'm pretty sure that I was sober the night before, So I don't know why the strange behavior happened. Everything was Normal before I went to the office to get my eyes checked.... even in the waiting room.
But when I steped into the room again I was greeted by a lady, She had to put the glass thing on my face , and everytime she came near my face i had uncontrollable case of the giggles,
It was embarrassing, plus i didn't want to offend the optometrist. I tried to apologize for the laughing but she had to do her job adjusting the glass thing.... Phoropter (Refractor head)
She was annoyed after a while , I was trying everything in my power to stop giggling it was more of a laugh in the middle and end
I couldn't stop period.

Finally she was done, she probably thinks I'm nuts or weird. That never happened to me in my lifetime before or after that incident.
What caused that reaction??? By the way there was nothing wrong with the lady , or funny about her. I still feel bad when i remember if rhat made her uncomfortable. She probably had a serious personality type as I remember, i don't know her well enough to make assumptions but She was very pissed lol

I felt like some annoying kid, not to mention i was an adult 😅 🙃 😩