Many magic rings... with strange powers!

[Morai]

Isildur puts on the Ring during the ambush. Instead of becoming invisible, he jumps to his feet and begins belting out "Come What May" from Moulin Rouge!, making all the orcs fall to the ground screaming in agony. Finally, one or two shoot him and he dies.

I find that hugely funny. How 'bout a ring that makes Orks cry and Ringwraiths laugh?
Woah, that's a strange thought.

Frodo is on Weather Top. Suddenly he finds himself surrounded by Ring Wraiths. He puts the Ring on.
Wraith #1: *hissing* Give the ring or..he he, STOP IT! STOP IT NOW! YOUR TICKILING ME!
Wraith #2: What's wrong with you?
(Wraith "floats" within laughing distance)
Wraith #2: Ah! Why am I laughing? You'll pay halfling!
Pretty soon, all the Ring Wraiths are rolling on the ground "screaming" with laughter. Frodo is accidently stabbed by a Wraith that lost control of his blade.