On more than one occasion (and probably upwards of 10) I've had the same conversation re: Britney Spears' bonus track Trouble sounding exactly like the beat from Madonna's Get Together.

Now, complete with audial evidence, the two sound even more alarmingly similar. But it's still a nice mash. Approved!

mp3: Britney Spears vs Madonna - Trouble vs Get Together

* not sure where this came from, or who put it together, but kudos to whomever did.