The Celebrity Endorsement. Sometimes it makes sense why that celebrity would endorse that product. Sometimes it doesn't make sense.
Toshiro Mifune for a Japanese Beer (via)
Muhammad Ali for d-CON roach traps (via)
Kriss Kross for Sprite (via)
Stevie Wonder for Mu-Tron III (via)
Sammy Davis Jr for Alka Seltzer (via)