yes....
one day my friend was tickling his g/f. He was sitting on her hip area, she was facing upward and he was tickling her ribs....she was going right off....I joined in, sat on her ankles and went tickle sole crazy on her pure white feet with gorgeously red painted toe-nails....her laugher was so intense I never wanted it to end....alas....I couldn't for more than a minute as I was worried how it would be interpretted.