You throw your head back and laugh loudly. This was getting to be far better than you'd planned it!

"MWAHAHAHAHAHAHAHA!!!!!!" you laugh. "MWAAAAHAHAHAHHAHAHAAA!!!!!!!"

Sam looks up joyfully. "You laughed!!!"

The importance of this doesn't strike you at first. "I did indeed!! It was a very maniacal laugh!!" You pause. "Wait...NO I DIDN'T!!! I NEVER LAUGHED!!!!! THAT WAS A.........A CHORTLE!!!!! A CHUCKLE!!!! CERTAINLY NOT A LAUGH!!!!!"

The only one who seems taken in by this is Aragorn. You decide to rely on him, stupid idea though this may be.

"Aragorn agrees with me!!" you claim, pointing at him. "Tell them, Aragorn!! You tell them!!!"

He glances at Arwen, who is still glaring at both him and you, and looks awfully confused. You take advantage of this as well.

"Aragorn, don't you remember the rules?" you say. "They say that if the person who laughs claims the 'chortle' rule, they can go free! However, this only works once during the entire game."

Aragorn scratches his stubble, and, with one last confused look, faints dead away.

You:

Say "This is obviously proof that he agrees with me."

Tell Arwen to do mouth-to-mouth or else he will die (your handy mallet insures this).