Pete and Dud

Two comedy heroes....in this sketch Dud is corpsing terribly (as usual) and Pete is mercilessly making making things worse by making Dud laugh even more (also as usual). As Dud chokes on the sandqich he stuffed into his mouth to cover his sniggering, Pete says "you enjoying that sandwich Dud?" Later they turn their attention back to the Botticellis - or rather the bottoms in the Botticelli paintings. Do the buttocks follow you round the room? And what happens if one buttock goes one way, and one the other?
Classic stuff.