Alright, this is an incredibly random one, and I was reminded about it by a
certain xkcd comic.
In Pokémon Channel, there is a TV channel called Relaxation Channel. When watching it, Mareep jump over a fence with a counter that displays how many have jumped while gentle music plays. Pikachu falls asleep while watching this channel. However, if you actually leave the game running for four and a half hours without changing the channel (or whatever causes the programming to reset), it will actually count all the way up to 5,000 before a commercial break.
I've attached two screenshots I took some years back.