strange experiment/unexpected?

i stumbled upon this galley/cafeteria in school where there was this one girl on a gurney with her bare feet bound cuffed by leather restraints and wearing some wires of some kind taped to her head and another girl attending her?? anyways there was this whole line of people apparently going up to tickle her. i watched other people tickle her feet, she was only somewhat ticklish and giggled heartily. i ended up in the line going up to her and while i was a few people before my turn, the girl with her was like 'watch this' quickly grabbed and tickled her sides and she laughed and shook wildly.

note i dont recall this story being exactly a true tickling story so i posted it here.