But folding endless stacks of tee shirts that shoppers are only so giddy to knock over (seriously, how do people manage to napalm an entire section of cardigans just to pluck an extra small off the top?) or making an endless assembly line of Frappuccinos for a horde of screaming pre-teens does one good thing for you: It makes you, from then on, respect and appreciate the hell out of the people doing those jobs. Work in a restaurant, you’re forever a good tipper and don’t go crazy with the special requests. Work in a coffee shop, you will never camp out in the back for an entire day after buying one muffin. Work in a clothing store, you’ll never leave a heap of clothes in the dressing room for some poor sales associate to find and let out a resigned “Come on, man, really?