It's Boss Time! (Professor Brains) - Jetpack Joyride 2 Music
I'd like to think that occasional gibberish is Brains' laugh. I know it wouldn't make sense past Legitimate Research, but still. (July 2023 Edit: And now that the other bosses have their own theme, it really does make all the sense)
Jetpack Joyride 2 and its soundtrack belong to Halfbrick Studios.