My sister sent me this one via email:

‘On my way past a church in Moravia, I read: “Can’t sleep? Try counting your blessings.”‘

Imagine the poor bastard who becomes an insomniac after he discovers that he can’t get above eight.

I had a good one myself, but I didn’t write it down immediately and, of course, now I can’t remember the exact wordage. I’ll try and get that tomorrow for you, if I can.