Just after the survival update, I captured one and made an enraged zombie farm. Unfortunately it broke due to a change in mechanics (thanks Ankara) a long time ago lol
For anyone interested, the name of this room is the "World Domination Room" within our base... Everyone knows that somebody looking to dominate a world needs an army, so we Qwerty--Sorry, Rhythimically --got Mr. Army-Generator himself to stay inside.
That's awesome, shame it died. I guess it was made to die so no one farms enraged zombies. It was a thing, that would be something very fun to make for the public on smp8 to use .
I remember ninjaboy trapping a Momentus not long after the survival update happened and he got like a SC of diamond blocks or something crazy.