7x08 Thermite vs. Ice
7x12 Knock Your Socks Off!
These episodes: one of the most awesome explosions ever in the first (lots of thermite + lots of ice); the most ridiculous-but-amusing 'myth' I've seen tested: is it possible to literally blow your socks off?
And finally, "It's unsafe to leave loaded guns in exploded rooms." MythBusters: essential consumer advice.
Once Upon a Time
1x13 What Happened to Frederick
6x39 (7/5/12 edition)
2x06 Inclusivity Day
[Watch it (again) in HD on iPlayer.]