Shortest Game Loop?

[hardcoretyphoon hardcoretyphoon]

What game can you think of where you can experience a proper "slice" of it in a short amount of time?

For example the average meatboy level tends to be less than 30 seconds. You can experience all of the games major mechanics (jumping, avoiding hazards, beating a level, the timer) within a small bit of time.

 

[PacGuy]

Atari games, like Yars Revenge for example. It's two quick boss fights repeated forever.

 

[bjork]

Don't Shit Your Pants. You can lose in one second

 

[Anoobis]

It would be a rare fighting game that you couldn't say that about it. Most racing games, too, for that matter.

 

[skramz]

in theory conway's game of life is the shortest loop.