Manfred: Okay, listen, if either of you two can make it across that sinkhole in front of you, the sloth is yours.
Sid: That's right, you losers! You take one step and you're dead.
[Sid throws a rock, which bounces across the "sinkhole" without leaving so much as a crack]
Sid: You were bluffing, huh?
Manfred: Yeah. Yeah, that was a bluff.