I'm not going to the big gaming convention this weekend because none of my lazy cheap friends want to go. Oh sure, they'll drive to my house for pizza and movies, but when it comes to driving an hour and spending $10 admission, it's too much for them! Friends suck. I'd go alone, but 2 hours in a car and walking around is incredibly lame by yourself.
Next time a friend wants a favor, I'll say "I'm too busy and am short on cash dude! Sorry!"