Sub-Zero has challenged "the inhabitants of Earthrealm" to the Ice Bucket Challenge (well, technically he said "mortal kombat" [sic], but whatever).
He's invincible...against challenges!
On a probably unrelated note, RIP The Wicked Witch of the West.
Viserys challenged "his whore sister" and "her savage horse lord husband," but neither have responded yet.
For real though, you can donate to ALS here. Do that instead of dumping ice water on your head for attention. Besides, no one's gonna top Chris Pratt.