Really? Wicked! I'd like to tickle her armpits when she's wearing that corset outfit she wore at Cannes in the Reloaded premiere. She looked real hot there!
The movie is Irreversible. Monica's real life husband Vincent Cassel, pins her arms over head and blows a raspberry on her underarm. She certainly seemed ticklish.
Be warned - it is not a nice film and Monica comes to a horrible end. The tickle clip is floating around on the net though.