"Th-th-there's this p-positron that g-goes into a bar and-and-and he says to the ba-barkeeper  Oh wait...  No, it was a neutron!  And-and he say "May I have a charge?"  Oh crap.  I-I've stuffed this up."
"The old explosive-in-the-microphone trick.  That's the third time I've fallen for that this week!"