>Boy goes into a grocer's.
>
>"Can I have a green loaf please?"
>"Sorry, we've only got blue loaves today"
>"Oh, that's OK - I'm on my bike"

Wow... I'd never imagine you'd have a "bezvezni" (literally, "connectionless") joke. I tried to tell a few here, but they never caught on.

Try this for size, nth time:

Q: why does the train go faster at night than on the rails?

A: because it's colder in winter than out there.