Wheel of Fortune

Wheel of Fortune is a game show.

History
When Marge once reminds Homer to go and get Bart on her way out the door—Homer says "I'm on my way", but unknown to Marge he is saying this because he is watching Wheel of Fortune and the exposed letters spell out "I'M ON MY WA*". Homer was so focused on the game show that he didn't hear what Marge said, and he forgets to pick up Bart.

Behind the Laughter

 *  is a real game show.