I was six years old and lured into the house and bedroom of a girl I had a screaming crush on. This was summer in the 1970s, so I was outside barefoot and shirtless in only a pair of shorts. She and two of her friends pinned me to her bed and spent a loooong (in my 6yo mind, anyhow) and rather exploratory time working me over from neck to toes. It was the most wonderful memory of my youth and without it, I probably wouldn't be in this community now.
Of course, growing up without a lot of money we had to find inexpensive ways to have fun. Ticklefests were quite common.