Actually, I have before.
My boyfriend(Yes, I'm still with him, it's a long story) tied me up once and interrogated me about what me and his brother were doing while he was out (I swear it was innocent). So he tied me up and tickled my feet, until I confused, which I did. lol
We play this game, this online game and I was one of the bosses, which means, I knew everything before everyone else. So he wanted to know what was going to happen with his character and he again, restrained me (tricked, I tell ya, tricked) and tickled me until I confessed. He tickled my waist (my most ticklish spot) and my sides and Stomach, this time around. Again, obviously I confessed.
In High School, my best friend wanted to find out what our mutal friend (that he had a crush on) told me about him, so when we were on the bus, on our way to an amusement park for a field trip, he started tickling my sides and would not stop, I ended up confessing that too. lol She got mad at me but I cuoldn't help it.
I've actually been Tickle interrogated alot by friends and family, over stupid stuff.
I've always wanted to be taken in for questioning by cops and then interrogated with tickle torture, until I confessed but in my fantasy, I was always the innocent bystander, who never saw anything.