guy moving in each case after about 15 minutes I had to go in just a couple minutes. Both said something like "that's too bad you have to leave before the fun is over" to which I simply replied "well, if it's not fun enough for your teenage boys to help [they were goofing around doing nothing], it's probably not going to be fun enough to make it worth my time to stay much longer". In both cases the boys were helping inside of 60 seconds.

I probably wouldn't have been so short if it wasn't for the fact that in both cases other guys there had brought sons to help who could have been home doing other things but were working hard.