Our air conditioning was scary leaking. I have a policy against messing around problems involving water AND electricity, so I didn't go poking around with a screwdriver in our moist, poorly lit HVAC closet.
He is my friend's husband, and he knows these joints inside and out. They came over last week with their kids. While the little ones ran 'round the house, he grabbed his bundle of equipment (which, sidebar, totally made him look like a Ghostbuster), and headed down to the Den of Damp to check it out. The problem was minor, and he showed me how to prevent it from happening again. Bonus!
All it cost me was a dinner. Who wouldn't be grateful for that?