The back

[Wade]

I love whether its me or my "victim" ...on the back... to tickle very close to the underarms...and down close to the sides....just close enough to make them giggle and squirm... it makes a direct spring attack under the arms and sides just amazing to see how they jump.

Reading that just made my arms squeeze tight against my sides.

So true! -- not only is my back ticklish but it's adjacent to so many excruciatingly ticklish areas -- fingertips on my back near my underarms are intolerable, and fingertips on my back near my sides, down by my waist, will unleash a torrent of helpless laughter. It's so easy to be rendered helpless when you're lying on your stomach, too -- all someone has to do is sit on you and your ticklish spots are hers to play with for as long as she likes.