Boards
Tired jokes/gags/puns that need to be never, ever used again, by anyone.
Preferably with somewhere you've seen it used recently.
"The yolk's on you!" - Egg based pun delivered to Richard Whiteley by a contestant on a repeat of Countdown from 1991 on Challenge.
"New Balls Please!" - shoe-horned into a tennis related Volterol pain relief advert. During above Countdown repeat.