From "New Scientist", attributed from R.D. Hayler, Stoke-on-Trent, Staffordshire, to a friend: Two sodium atoms are walking along the street when one stops and says, "Oh my God, I think I've lost an electron!" "Are you sure?" asks the other sodium atom. "Yes," replies the first sodium atom, "I'm positive."
(From the "Rest" of RHF)