My father is a tram driver so i can use any tram/bus for free because of it.
My mother is a cook at a restaurant and i can go eat there for free when i want too.
Personally i am a student in buildings & constructions so i guess i will never have to hire someone to build me a garage or something like that.
They are both very useful for me, but how about you? What perks does your job offer, and how do you like it? Is it useful? What job you think has the best perk in the world? What job perk would you want? (But those like ... astronaut - you get to travel in space :P)