I.T. They spend most of their time cleaning after people going on porn sites, and when they're not removing viruses, they have to explain why the computer needs electricity to work. No joke.

Driving instructors. Yes they deal with people that don't know how to drive, but those are rarely the idiots they complain about. The real idiots are the "experienced" drivers who do so much to stress the learning newbie. Ever failed a driving test because someone cut you off and you HAD to drive into a one way street?

Call Center workers. Besides the people asking absurd questions there are pranksters that waste their time. But the worst are the night hours when lots of perverts call.

Royal Guards. They have to be still so many people try to make them move. People taking selfies or telling jokews are the least of their worries.

Firefighters. They risk their lives to save you, when tragedy strikes. Many of the risks could be avoided, as many people burn their property for insurance money or to be the... star of YouTube.

Speaking of insurance money, we have accountants. People hire accountants because they can't take care of their own accounts right? But many of these people say accountants cheat because "they thought they had more money". And when a businessman hides his money who is responsible? The accountant.

Bartenders. Drunk people do stupid things, and when you're a woman all the drunk fools hit on you.

Therapists. They meet people making many wrong decisions, but you know what they don't do? They don't make sure they follow their advice, they have no way of knowing, until they come back with the same problem.

Teachers. They deal with kids, kids are ignorant and hormones rule their bodies. Teacher needs to guide them to wisdom and not hurting themselves, dozens at a time. But those aren't the idiots, the parents are. Every time teachers try to change some kid's behavior his parents tell them to stop and then complain how the school does nothing to "educate" their kid. Logic?

The doctors and nurses at the ER. If you can't call a guy with a light-bulb in his rectum an idiot, who can you call that?