Very interesting question.
For those that can tickle themselves, what reactions do you have? Do you laugh out loud, do you have to stop because it tickles too much, do you just twitch and squeak or what?
I can, on occasion, take my shoe off and slide my foot ver the heel of my shoe and I *almost* laugh...but its more like when someone else is trying to tickle me and not doing a good job so it tickles but I can fight it. Did that make any sense?! LOL! Then I stop before it really tickles!
~ toyou