Wristcutters
The main characters go to a hell/purgatory specifically for people who've committed suicide, where no one can smile. It's not a very action-y movie, but it's one of my favorites. Also, it has Shannyn Sossamon from A Knight's Tale, so that's a plus
Schezuan peppercorns. I've had the same packet for years because it takes so little to add a very unique, peppery numbness to any Asian dish. Literally grind up a pinch in a mortar and pestle with some msg and put it in any Asian cuisine to elevate all the other flavors dramatically