"I'm trying trying to make your day more fun," guy. Goes through the drive thru half wasted or mentally handicapped, usually late at night. Going through in some ridiculous fashion: such as backwards.
"Ow my ears are bleeding." There are three types of this douchebaggery. Yellers, who automatically think that they are gonna have to speak way too freaking loud for the poor worker to hear. Some have noisy kids, usually crying about not getting exactly what they wanted. They have an unnecessary amount of brats in their car, usually this also makes the parent have to speak over the kids causing the first version. And last the dogs, these people that take dogs everywhere. Some have sanity and keep them in the back so their sounds are muffled, but then there are the ones that have their wildly yapping pom or chihuahua on their laps.
Handouts people. Once again late at night usually just before or slightly after closing. These guys come directly to the window and ask if they can get whatever you may be throwing out. Not to say I have no compassion for the homeless, but these guys are definitely not homeless, often driving hummers or something of simular size.
"Hey its me again." They live in the neighborhood and they come to the drive thru so very often that when they come inside, the person at register probably has a good idea as to what they are going to order. But they don't realise that 1) they cannot be seen over the intercom thus cannot be recognised, 2) saying, "Hey its me," probably doesn't give any clues as to who you are.
Lastly, the "Dump This For Me's." Sadly enough I can recount many a times where I fit this, and I apologize profusely to anyone I may have wronged doing this, just know it was not my idea. Mostly because I was with someone in their car.
You go finish up handing them all their food and being paid any everything. Then they hand you back a bag of garbage that has been sitting around in the vehicle for god knows how long, asking you to throw it away for them. Now you must go rewash your hands, because the bag was soggy or stinky or just somehow unpleasant.