Toasty!

"Toasty" was an easter egg first featured in Mortal Kombat II.

It originated as an inside joke between members of the Mortal Kombat development team, and made its way into the game via an image of sound designer Dan Forden appearing in the lower-right corner of the screen, and saying "Toasty!" when the player performed a particularly vicious uppercut.

On the Portal stage, if players pressed down and start while Dan's face was still on the screen, then they could qualify to face Smoke.

The "Toasty" joke quickly became an element in Mortal Kombat and reappeared in many places, such as in Mortal Kombat 4, where Dan Forden would say "Toasty 3D!" making a point of the fact that Mortal Kombat 4 was the first game in the series that utilized 3D graphics.

It was also discovered in Shaolin Monks, where if the player pulled off a long chain of hits, that Dan Forden would say "Toasty!", but his picture would not appear. If the player pressed start while Dan was still talking, then they would be awarded with 1000 experience points. It has also appeared in Deception in two places. When playing Chess Kombat and putting the "Kill" spell on another player, Dan will say "Toasty!" on rare occasions. In Deception's Konquest mode, if you want to acquire the Earthrealm Kamidogu without obtaining the password first, Shujinko will try "Toasty" as the password and gain access.

It's also been stated by one of the first MK staff members that "Toasty, began as You're Toasted and just evolved from there."