I have to have two packets of ciggies on me at all times.
For me, this is just like real life!!! LMAO!
Ok, my quirks are -
Ham Radio's - turn everyone on!! Even to the extent that if i enter a room and i have already turned it on, i turn it off them back on!
Normal transistor radio's - see Ham Radio's.
Having to exhaust every single piece of dialogue with everysingle person. To the extent where all the conversations do not have any highlighted text remaining.
Taking every piece of money i can find - NCR, Legion Denarius, Aurius, pre war money, caps the lot
If a red marker appears on my screen i have to hunt it and kill it - and thats with ED-E's long range finder
Opening every stall door - like someone mentioned before, this comes from FO3, where sometimes there was loot or a trap or an enemy in the stall.
Searching through every container in every room of every building. WHAT IF I MISS SOMETHING!!!! lol
When i am in an area with multiple doors, exits, rooms etc i will search through the area i am in first. I will not go through a door where it leads me to another area. I will only open doors that are simply marked "door" before going through one that requires a load.
There are probably alot more things i do, but to me they dont seem strange or weird or anything!!! lol
On a slightly different note, during the quest where i needed to find the rocket fuel for that ghoul cult thing. It was mentioned that the toy rockets for sale in Novac gift shop ( inside the dinosaur ) contained the required fuel for the space craft. Yeah, i took everysingle toy space craft there. I now have like a million toy spacecraft stuck in my inventory. Good job they are quest items and dont count against the weight!!!