I well remember this entrie sketch, a very well done and enjoyable one. David is granted 3 wishes by Maria the genie and without hesitation says, "Oh I want a boat, I want a boat." Maria doesn't hear him correctly and grants him a coat. For his second wish he repeats he wants a boat but this time Maria gives him a goat. With his last wish coming up, he tries as hard as he can to make it very clear that he wants a BOAT. Maria finally hears him correctly. But alas, the boat she makes appear is a little toy boat for bathtubs!
A great example of vintage Sesame Street - superb entertainment while at the same time achieving education (teaching about words that rhyme - coat, goat, and boat.)