Going crazy!!!
I once made a Deathpit. Throwed lions, bears, elephants...almost every animal you would like to see in a Deathmatch.
Then, i made the Raccoon City Zoo from Resident Evil Outbreak 2 in the City Freeform Map, put only the animals that appear in that game and then released them only to see them wrecking people (Lions, Hyenas, Crocodiles, Elephant...)
Released my T-rex and the Spinosaurus to see them fight to death...
A favorite, throwing guest to exhibits.
Putting personal in front of a running free T-Rex
Delete all the fences...
Just some happy destruction.