Why You Always Tip Massage Therapists

My girlfriend rattled off this line while I was pitching her a long list of less funny punchlines:

... they have no place at renaissance fairs.
... tradesies?
... both are better-looking in the movies.
... deeply disappointing.
... I sold mine to China.
... of unimaginative people.
... burn it to the ground

I sometimes cycle through a lot of punchlines before getting to something I like. It's very humbling to struggle with a dozen words for two hours straight and have someone else walk in and knee-jerk a better solution.