"One Man Bucket"
I'm convinced this character owes his entire existence to Pratchett being able to haul this joke in:
"Why are you called One-man-bucket?"
"...In my tribe we're traditionally named after the first thing my mother sees when she looks out of the tepee after the birth. It's short for 'one-man-pouring-a-bucket-of-water-over-two-dogs.'"
"That's pretty unfortunate."
"It's not too bad. It was my twin brother you had to feel sorry for. She looked out ten seconds before me to give him his name."
"don't tell me, let me guess. 'Two-dogs-fighting?'"
"'Two-dogs-fighting?' 'Two-dogs-fighting?' Wow, he would have given his right arm to be called 'Two-dogs-fighting.'"
A great sampling of more Pratchett goodies where I got this one.