1. When you call in sick at work, you tell them that you have Advanced Radiation Poisoning.
2. You name your dog "Dogmeat", your cat "Catmeat", your horse "Horsemeat", and/or your daughter "Bumble".
3. You resent the fact that you have to eat, drink, and pee in real life. You don't in "Fallout", after all.
4. You stop thinking of Liam Neeson as Qui-gon Jinn, Aslan, etc., and just start thinking of him as "Dad".