Not sure about this jizz thing...hehehe

The cups I can understand. Pebbles in hollows being swirled round by water make big holes. The Devil's Arse in Castleton has a tube that reaches up to Peveril Castle, hundreds of feet above, and was bored out from below by water/rock action, and has a 40-ton boulder wedged halfway up. I was flapping a bit staring up that hole just in case it decided to come loose...

I dunno, no experience in these matters and an active imagination, probably doesn't help one bit!