When they are bad, they are sooooo bad.
I had the laziest boss when I got out of college. She got into the office at 10, but wanted me there at 8 to turn on her computer and turn on her lights and answer her phone (I was supposed to say "she's on the other line.") She'd routinely take 2+ hour lunches, and come back and talk about totally inappropriate things (where she got her bikini waxing done, how much it hurt, or one time talking about whether to buy a pushup bra, etc.) She stayed past 5:00 pm maybe twice in the year I worked there, but mostly had to meet people for "work" and would leave at 4:30. She'd get angry if I wanted to come in late or leave early (no one to cover for her office lights, computers, etc.) I once left early and didn't tell her--because she wasn't there to inform--and she b*tched about ME on facebook... I was so steamed!
Oh, and she asked me to pick up her dry cleaning. I just stared at her like she was speaking another language and she dropped the subject.