Well, I can try and describe it by heart.
Fujiko is once again knee deep in trouble.
After double-crossing her comrade-in-crime, part-time-lover, and full-time-competitor Lupin, she finds herself stuck on a tree, hanging from a parachute.
She is holding two suitcase, full of stolen diamonds and won't let them go, despite her precarious position.
Lupin and Jigen know how to make her more "cooperative".
Lupin forks out an extensible grasping rod - much like a telescopic fishing rod, with a grasping handlike device on its end.
Slowly the grasping device reaches - to Fujiko's horror - the stuck female thief.
Grinning widely, Lupin activated the hand and procedes to tickle Fujiko's pits and ribs.
Hapless and stuck, Fujiko starts laughing hard, and eventually lets the cases go.
A veritable diamondfall.
Overall a nice scene, not too short, with great anticipation value.
Much less known than the other scene, and probably less etched in popular fantasy - yet good nontheless.
Hope it helped a bit pinpointing the scene - if not the full episode.
Reg's.