I only have one that sticks in my head, and it was a big T&G job at at retirement home. Doing the pre-job walk through with the admin. I explained that when I applied the finish that it could not be walked on for 4 hours, and after that only light foot traffic for 24 hours for the best results. She said that it was OK, do the best I could with the conditions, she knew the residents would be running in and out and nothing could be done about it, she just wanted it to look better.
After 2 days of scrubbing, stripping, finishing, fighting with the residents to keep them off the floor, and having to refinish areas they messed up, the WORST job I ever had was finally finished and looked good. About a dozen of the residents who had been pestering us thru the whole ordeal lined up to tell us how great everything looked, how the floors never looked like that before, etc. The employee who had been assigned to oversee us was happy, everything was just rosy! Until the "understanding admin." showed up Monday.
I got a call from this lady screeching in my ear about how awful the floors were, I had to come back and redo the whole job! Right now!
I trudged back to the place expecting a disaster. Did something go wrong with the finish after we left? NO. She found a few spots on the floor where there were some bits of sand or something that had been tracked in by her residents while we were working. You had to get down on your hand and knees and reeeally look to find these spots. For this she demanded the whole job be redone- 5 or 6K of terrazzo. I said "NO, thank you, I will not spend another 5 minutes on this job." and handed her the bill, which included an additional $350 charge for having to deal with her residents.
The bill was paid about 3 months later after I sent a few collection letters. I never got anymore work from them but you couldn't have paid me triple to step another foot in that place again!