Tortoises
THREE tortoises, Jim, Ray and Geoff, go for a picnic ten miles from home. It takes ten days to get there, and they find they've forgotten the bottle opener. Jim and Ray ask Geoff to fetch it. "No way!" says Geoff. "When I go you'll eat my sandwiches."
They promise not to, so off Geoff goes.
Ten days pass, and he's not back. 20 days pass, and he's still not back . . . Jim and Ray are starving, but still don't eat the sandwiches . . .
25 days pass and Ray says: "We'll starve if we don't eat!" So they start to eat the sandwiches.
Geoff jumps out from behind a rock and shouts: "I knew it, you liars! I'm not going now!"