During the Iranian Hostage Crisis in 1980, Iranian Foreign Minister Sadegh Ghotbzadeh (usually pronounced goats-buh-day) was a well-known figure involved in the negotiations for the release of the American hostages.
Karnak: (holds envelope to head) Ghotbzadeh.
Ed: Ghotbzadeh.
Karnak: (opens envelope and reads contents) What does an Iranian do when his wife withholds sex by night.
It took a moment for the audience to get the joke, but when they did it was one of the longest laughs I'd ever heard on the Tonight Show!