1- I would spend every single penny.. make sure the bank employee learns the lesson
2- I'll say "hiiii, long time buddy" and make sure he pays for our meal.
3- I'll look for my car and walk away from someone else's car..but before that, i'll scratch that car with my key so that next time i don't make the same mistake.
4- Galaxy S3.. i'll take it to used mobile shop and exchange it for iPhone 5.