A friend of mine ("Sherri") works part-time with a campus ministry at a local university - she just finished grad school last year, but she's been a student mentor and the soundboard person for evening worship and the website IT person and a bunch of other little things which probably add up to a lot more hours than she's paid for. The pastor of the nearest [her denomination] church is the leader of the campus ministry group, then there's an associate pastor who helps out and Sherri who does the majority of the day-to-day work.
The associate pastor "Bob" got married this summer. Sherri also makes wedding cakes and is trying to start her own bakery, so Bob and his fiancee asked if she would make their wedding cake for them. He offered $500, with the understanding that the wedding reception would encompass X people (I don't remember the exact number, but I think it was around two hundred). Most bakers would charge three times that, but Sherri agreed and told Bob the remainder of what she otherwise would have charged would be her wedding present to them. $500 pretty much covered her materials, but that's a LOT of baking!
A month or two before the wedding, Bob came back to her. See, there were some extra people they had forgotten to invite, so the reception would be closer to 1.5X people. And since it would be so much bigger, they weren't having it at the local church, they were having it in his fiancee's hometown - three hours away! Oh, and his fiancee thought $500 was way too much to pay for a cake because hey, sheet cakes are like ten bucks each at Wal-Mart, so they wanted her to do sheet cakes instead of the fancy ones she had planned and they'd pay $250 instead.
Sherri explained that a) $500 was already assuming $1K worth of wedding present, b) she wasn't going to be driving an extra six hours to deliver these cakes to their new reception, c) she'd have to rent a van and get special equipment to transport sheet cakes instead of the specialized kind she does which are much easier to transport, and d) she was already going to be baking for a solid week to get cake for X people; 1.5X just wasn't going to happen.
As you can probably predict from a special snowflake like this, Bob threw a big fit because Sherri "canceled on him at the last minute" and they had to go get store-bought cakes for the reception instead. (Which they did buy in his fiancee's hometown, so at least nobody had to drive a van full of cake there!) Sherri mysteriously never got an invitation to the wedding or the reception.
This actually crosses over into professional darwinism, because the head minister had already noticed some disturbing tendencies in Bob - such as his propensity to take the church's expensive sound equipment home with him for his own personal use whenever it wasn't being used at church (that he knew about). Sherri did a surprise inventory this month and discovered that of the four Very Expensive Electrical Doohickeys they owned, two were missing (one eventually turned up in Bob's car) and two were broken. Sherri thinks Bob was borrowing them and just swapped them out when he broke them (which is apparently pretty easy to do if you don't know what you're doing). It's up to the church board what to do now, but I really doubt Bob will come out of this looking good.