1) I jump in hoping to find Wonderland.
2) I jump in hoping to find The Ruins.
3) I tend to throw stuff down there.
4) I slam my face in there, yelling, "I KNOW YOU'RE DOWN THERE, MARY!!! I'M STILL MAD AT YOU!!!"
5) I may or may not shoot the hole with a rocket launcher, thus killing anything in there or causing an earthquake.