Secret after returning to checkpoint

[Awesomeguy 99]

Going back to the last checkpoint by pausing and doing it or just pressing Backspace, leave the screen for a while and you'll get some "Smooth Jazz as you decide."
Don't know if this is really well known or not but I decided to post it.

[Supershroom]

This is well known, and don't you think this "smooth jazz" is too smooth to be pleasant? This is supposed to make you continue the game after you die or respawn voluntarily.