Terry Pratchett is the only author I can think of, other than Wodehouse, who can make me laugh, out loud and uproariously, with a single line - sometimes a single word. Even the late, great Douglas Adams, as much as I admired him, couldn't do it.
My username represents a time when I laughed until my stomach hurt [Spoilers! for Men at Arms]:
DON'T ARSK US ABOUT:
troll's with sticks
All sorts of dragons
Huje green things with teeth
Any kinds of black dogs with orange eyebrows
Rains of spaniel's
It's a silly, simple thing. As with most subtle humour, analysing it would probably break it, but I lost it at "Any kinds of black dogs with orange eyebrows" and really lost it when I got to the second "Mrs Cake".
Another one that really made me lose it was from [Spoilers! for A Hat Full of Sky]:
"Come Quick!" she yelled. "He willnae tak' a drink. I think he's deid!"
I'm sure we all love Terry Pratchett's humour. But when has he really tickled you? Which lines made you laugh out loud? Trust me - I'm a black dog with orange eyebrows.