A moon-tain.
X-post /r/puns Scotch.
The Rolling Stones say 'hey you, get off my cloud.' the Scotsman says 'hey MaCleod, get off my ewe.'
There's just no atmosphere
A luna-tick.
Because when people fall off of 'em, they yell AAAAAAAAAAAAAAAAAALLLLLLPPPP!!!!!!!!
A mountain with the hiccups.