One of mine has got to be chiropractors. At my gym, if you so much as touch your lower back, about five of them appear as if by magic, business cards at the ready.
I think the "I hate lawyers" thing is way overdone, though. Some are good, but some spend their whole lives defending people's rights to free speech, freedom of assembly, etc.
On the other hand, it's hard to imagine a telemarketer who works selflessly for the greater good.