Last summer, down on Lake Isabella, located in the high desert an hour east of Bakersfield, CA, a blonde, new to boating was having a problem. No matter how hard she tried, she just couldn't get her brand new 22 ft Bayliner to perform. It wouldn't get on a plane at all, and it was very sluggish in almost every maneuver, no matter how much power she applied.
After about an hour of trying to make it go, she putted over to a nearby marina. Maybe they could tell her what was wrong.
A thorough topside check revealed everything was in perfect working order. The engine ran fine, the outdrive went up and down, and the prop was the correct size and pitch. So, one of the marina guys jumped in the water to check underneath the boat. He came up choking on water, he was laughing so hard. Under the boat, still strapped securely in place, was the trailer.