10 Amazing facts about GTA V

1. Failing and repeating a mission will give you a several slightly different versions of the same pre-mission briefing dialogue.
2. Flip flop actually flop when worn - they aren't glued to the bottom of your foot.
3. When wading in water, your clothes get wet - but only up to the point ou actually waded. the rest of you stays dry.
4. If you hail and hop into taxi at the airport when someone was already waiting for one, they'll get mad and shout at you, or try to pick a fight.
5. Michael will confess to and discuss random events that just happened when visiting his psychiatrist, like sleeping with prostitutes or running over pedestrians.
6. If you talk to a character on the phone and call them again right afterwards, they comment on having just spoke to you.
7. Backfiring cars can ignite gas trails.
8. If you stop your car in the road and block traffic, drivers behind you will flick you off. 
9. If you try to force Trevor to listen to certain kinds of music, he'll get angry and overide you, changing the radio station back himself. 
10. If you spend a lot of money customizing your car, random NPCs will stop and compliment you on it, and start snapping pictures.

We didn't discover these amazing fact on our own - huge thanks to the great communities at Reddit and GameFAQS for initially discovering on these finds. And by the way please share more GTA v details in comments.