ironic handgrenade

When someone throws a handgrenade With high hopes for it to go somewhere but instead the grenade Returns to the one who threw it, either because the grenade hit something on the way or landed on something wich changed it's direction drasticly.

Might also be used if the enemy throws the SAME grenade back.

"See this gory mess on the wall ? That's what remains of the guy who threw a ironic handgrenade"