think the two on the left had wandered over from the machine head shoot(
drimble he'd been white, he'd been black, Tue 10 Mar 2015, 14:58,
archived)
I think the middle one is Henry from Eraserhead(
2 Can Chunder Word to your mums, I came to prod bums, Tue 10 Mar 2015, 17:53,
archived)