Was playing 5e D&D last Wednesday, and we're doing the pre published module. We were facing the over-chief of the lizardfolk, who we're kinda co-opting to take out the dragon cultists. They're uniting behind Snapjaw, whom we've befriended. The suncaller (over-chief) had just taken out half of our tank's HP in one round, and is up next after me. If he doesn't go down, he's totally murdering the shit out of snapjaw. I'm a lv 3 arcane trickster rogue, so I havetwo spells per day. In a desperate attempt to wij, I cast Hideous Laughter. He nat 1s his will save, then fails his new one at the end of his turn. Snapjaw is up, he attacks, and... Nat 1. Bu, as the suncaller is incapacitated, he has advantage. He hits, auto-critting, and manages tokill him.