Your Theme Song?

Interesting thread idea.

For me it depends on the game. If I'm plaing Tide of Iron it's the Wheel of Fortune theme tune said as if the title was Wheel of Fortune

Tide... of... Iron...

Really irritating. If it's TI:3 then I sing Welcome Home Sanitarium from Metallica because the lyrics can be switched around easily. You can say Twilight Imperium to the tune of Sanitarium (with a little sylable squeeze) and you can add great lines to the verses like;

"The text on the hex says Mecatol Rex"

The first line doesn't even need to be changed;

"Welcome to where time stands still, no one leaves and no one will"... for six hours anyway.

In other games it can be anything, but changing lyrics to be about our gay love for each other is very common. MJ's thriller becomes Filler;

"Filler, Filler dude
just shove that sexy cock into the place where I just pooed and I said
Filler, Filler dude"

Take is Easy becomes Make it Greasy. My brother especially hates the second verse;

"Looking for lover who fucks like my brother and takes me from behind
I'll keep it greasy so you can please me..."

you get the idea.

This one always sticks when I play wargames, usually because my troops get torn to shreds, just like the hapless Starship Troopers!
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When I'm fiddling with the taskbar in Windows, and I have to click the "Lock the taskbar" menu item, The Clash's "Rock The Casbah" automatically starts playing in my head, obviously with modified lyrics. It was funny the first couple of times. Lately I just try to avoid messing with the taskbar.