Bud Prager. Responsible along with Mustaine for making Risk.
The cover of "These Boots" on Killing Is My Business... was removed from pressings of the original master released after 1995 after the song's original writer threatened legal action. For the remaster, Megadeth was allowed to use "These Boots"...but they couldn't use the Megadeth version. Thus, they recorded it with the original lyrics, and then Sound Effect Bleeped all the lyrics that were changed in the original cover. Dave wasn't happy about any of this, and made that very clear in the liner notes and in his autobiography. Fortunately, the original version is quite widely available amongst fans.
Mustaine had originally intended The System Has Failed to be his solo debut; however, it was branded a Megadeth album because he owed Sanctuary Records one more Megadeth album.
Cristina Scabbia is the one singing with Dave in the remake of "A Tout Le Monde", from United Abominations.
David Draiman of Disturbed fame sings guest vocals on the song "Dance in the Rain" from Super Collider.
Name's the Same: This was the impetus for Mustaine choosing the name of "Set The World Afire". When done live in 1984, it was called "Burnt Offerings", but by the time he went to record it in 1988, the band Testament had become well known with a song called "Burnt Offerings", so he changed the name to "Set The World Afire". Just as well he didn't use the title, as Iced Earth would call an album and song "Burnt Offerings" in 1995.
Also has a song called "Bodies", not to be confused with the well known song "Bodies" by Drowning Pool (AKA "Let the bodies hit the floor").
One of Us: Dave is a fan of Gigantor to the point of naming his music festival, Gigantour, after it.
Throw It In: The end of the band's cover of "Paranoid" includes Dave yelling "Nick...Nick...Nick!" to get the drummer (Menza) to stop playing, to which he responds "Fuck. Me. Running!" That can count as well as a Crowning Moment of Funny.
Sometime around the end of The Eighties, Mustaine wanted to add Darrell Abbott and (possibly) Cliff Burton to his formation. None of these resulted, due to the death of the latter and the former wanting to play with his brother (who is a drummer) while the drummer role was already occupied by Nick Menza. Could you imagine how awesome the band would became if said members (the Abbott brothers & Cliff) would have been members of Megadeth? See the entry on the page for details.
Their cover of the Duke Nukem theme was going to be part of Duke Nukem Forever's soundtrack. To rescue it from being a Long Song, Short Scene, it was included in Duke Nukem: Music To Score By, the Japanese edition of Risk, and several compilations such as Warchest.
On the same vein, "Gears of War" wasn't finished for the time of the game's launch, though the coverart◊ for the single depicts the game's logo and typographied name. The song was included in United Abominations, and the single was released, anyway.
Early tracklistings for United Abominations include "The Bodies Left Behind" as one of two pre-order bonus tracks. In the end, the only bonus track was "Black Swan". "The Bodies Left Behind" is likely to be the same track recorded for Endgame as "Bodies", and whether or not it is, it would be interesting to hear this particular recording.