Anime/Manga fandoms in alphabetical order:
Berserk, Fruits Basket, Full Metal Panic, Genshiken, Gokusen, Hikaru no Go, Initial D, Mushishi, Ookiku Furikabutte, Pumpkin Scissors, Rurouni Kenshin, Zipang
Tv-show and movie fandoms in alphabetical order:
Angel, Buffy, Dark Angel, Firefly, Pitch Black, Supernatural
Mostly gen, canon, episode tags, but also some pairings: Buffy/Spike, Max/Alec, River/Jayne, Saki/Madarame
Getting surprised by unexpectedly awesome crossovers. For example, at the time of writing this, the one and only Supernatural/MacGyver fic.
The impala has a bench front seat. Ergo, it can't recline separately for driver and shotgun.
When outside, people fall/crash/get thrown to the ground. Not the floor.
Non-canon obvious application of a writers own faith/political view.