I have been doing some brainstorming of bad tickling experiences and I just remembered one that I had actually blocked and still makes me chill.
(First off, english is my second language and most of the terms I know them in Spanish, and am not sure how they transale in english, so try to use your imagination)
It was a few years ago. There was a fair in town, one of those events that have rollercoasters, high rolling stars, Pirate Ships, and kiosks. You know where you have to throw a ring into a stick and you get a price.
I was there with some friends (both males and females) hanging out. One of the little attractions was a human being strapped to a circle and spinned around like hell for a few minutes or until he/she screams "Stop".
My friends started teasing me that I wouldn't last a minute in that thing. And after some debate they challenged me and I was determined to prove that I could last the entire time. I have to go all the way. It was an open bet, meaning that If I loose, they choose the punishment.
One thing is to see it in third person, another is being in there yourself.
My turn came up and I step in. The clerk told me to take off my jacket, shoes and keys (everything that could fly off me or hit me while spinning).
So I stepped into the wheel in a T-shirt and jean pants.
I had to pull of my arms until my wrists where inside a pair of rings that the clerk tightened and locked. Then I put my feet in another pair of those rings and the clerk lucked them too.
At the end I was spread eagled. My entire weight rests on the wheel. Just like that made me nervous.
The clerk asked me if I was ready. I looked at my friends and said yes.
Then he removed the safe and started spinning the wheel and the world was spinning around me.
About 20 seconds I gave up and asked to stop. I was so frustrated.
When the wheel stopped the world stayed spinning for a while and here came the worst part because since I was deasy and partially out, I wasn't aware of what was going on around me.
My friends asked the clerk to approach me for a few seconds.
They sorrounded me, teasing me for my failure, and started tickling me all over. Armpits, ribs, stomach, legs, even my feet.
I was laughing histericlly, still dissy, but I could see and hear the audience laughing and enjoying my public humilliation which lasted a some minutes until the clerk told my friends that their time was up.
Then he unlocked my hands and feet and I was free. My friends where laughing as hell. And I was so frustrated because I loose the bet.
The torment was over but the public humiliation lasted the rest of the night until we left the fair.