The ones that get to me the most are the ones that get you in for A,B & C, then try getting more work done when you're there, using the excuse, I didn't want to scare you away, if I gave you the full list.
I just tell them, payment for ABC and give me a full list and I'll be back in another 2-3 weeks to do the rest. I can't do it until then as I'm fully booked.
My other pet peeve is the ones who get offered a date 2-3 weeks down the line, decline it due to needing it done yesterday. Then ring back a week later and are shocked to hear that date has gone and they looking at 2-3 weeks from the date of second phone call lol