Seinfeld and Kramer can't find Elaine...
She left a note saying "I'm leaving tonight for a new life"
The two of them try to track her down, but all efforts fail to find exactly where she is. They search all of the Americas, Europe, Asia, Antarctica, and Australia with no luck, so they ask Toto to help out.
Eventually, using process of elimination, Toto says to Seinfeld and Kramer, "I guess Elaine's down in Africa."
EDIT: Added bits to clarify and help set up the joke. I thought of it this morning after 1.5 hours of sleep so it wasn't well-written at all.
Kramer died when a billboard fell on top of him
He was sign-felled
