User blog comment:LimeyGreg/PENTAKILL/@comment-5331854-20130726092734

Good idea, but the potential would get lost for most voices. While it is possible, you won't see many supporters, junglers, assassins, tanks and bruisers penta-killing often. In my opinion, whenever an ace occurs, a random champion of the ace'ing team will do the global taunt. He won't taunt again unless everyone else has taunted (which needs 4 or 2 more aces, naturally). This way, every player has a chance to feel badass. Of course, the ace'ing champ could get the priority for taunting unless he already taunted.

The biggest problem is that new one liners in LoL can't print money for RIOT, so it's very unlikely.