Bohemian Rhapsody is an obvious answer.
For me personally Headstrong by Trapt
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Riders on the Storm, it's not my favorite song of all time or anything but I can't help myself when it comes on.
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I'm banned from singing out loud when I'm around my girlfriend, which is most of the time :( Pray for me in these difficult times, brethren.
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I'll sing any song I know the lyrics to :P
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All these things that I've done -The Killers
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If I know the words, you know I'm singing it.
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Master of Puppets - Metallica
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Definitely Bohemiam Rhapsody. and any Pony song
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You and me baby ain't nothing but mammals, so let's do it like they do on the Discovery Channel. Gettin' horny now!
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Don't Stop Believing - Journey
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Pretty much everything I know the lyrics to.