Only thing wierd that I do that others might not is talk back to all the NPCs in real life. I never just let one of their one-liners in passing go without some comment to my screen. Sometimes out loud, sometimes not... but I always respond somehow.
LOL Oh yea, I do that, too on occasions. "No Lollygagging" - " Oh yea? You talkin' to me, guard?" I love to get right up into the guards faces too, so they have to take a step back. LOL
I just can not make myself skip past a jar or urn without checking it for gold coins. My last character had over 99K gold, but I would still search desperately for every single coin I could find. I just don't think there will ever be a point where I stop doing this. I want to ... but I just can't.
OMG the Urns will be my downfall. That's why a 20 min dungeon takes me like an hour. LOLOL I have to LOOT everything! Now, I did cut back with my lvl 56 character, but man, you never know...
I think the weirdest thing I do is for just about every save, i arrange the screen so that the save screenshot got some kind of "theme" to it, IE I'd rear my horse on top of a hill so the camera angle shows a nice silhouette against the backlit sky, I'd move into position so that I get a nice shot of a spectacular scenery, and when on foot outdoor I mostly try to get my companion and horse in the picture. Don't ask me why.
I keep all my hoarded stash divided up in different categories. Weapons in a chest next to my bed, clothing and armour in a dresser, miscellaneous items in another dresser, jewelry in an end table, potions in a drawer in the kitchen.
I also compulsively pick up different ingredients I "think" i don't have too many of and store them all in my house, even though I rarely use Alchemy. I also save my game too often because I don't like doing tedious stuff like looting the same corpses and urns all over again if I die.
OCD, me? Nah.
*cough*
LOL I think I can't walk past a plant. Must harvest everything in sight (even if it just sits in my "ingredient barrel"). I also have a place for all my stuff. Raw Materials goes in the trunk, jewelry in the end table, special crafting equipment is stored in a separate end table, kitchen Utensils and pots are stored in a kitchen cabinet, Food is stored in a separate barrel from Alchemy ingredients. Books are usually sorted by topic on the bookshelf... there is order in my house! LOL Weapons of course go on the wall displays! lol
I must decorate flat surfaces in my house (a bowl of Apples, a plate with cheese, a book etc.) All houses are decorated!

Dwemer Bowls! I think I carried over 40 bowls out of one Dwemer Ruin once! LOL I haven't even used them all!