This one's pretty self-explanatory. Songs get stuck inside my head all the time - everything from old PSA jingles to Top 40 songs I don't remember consciously listening to (ah, the gift and the curse of the day job). But the following three are my brain's go-to's. With good reason.
1. Dead Weather's "The Difference Between Us" - the hottest psycho chick song of all time.
2. Turbonegro's "Stroke the Shaft" - probably the worst instructional handjob lyrics in the history of the act.
3. Led Zeppelin's "In the Evening" - greatest slide riff EVER.