You dance with the chick you took to the prom. If you were a tightass and just washed your car and bought the cheap corsage, you end up with your ugly third cousin with zits and fat ass.
If you ponied up and rented the limo, you get to take one of hot girls in the high school and probably get laid as well.
If you spent some but not all, you get to borrow your uncles convertible, take a pretty good looking girl and probably get laid if you have any smoothness qualities at all.
The Packers are the third choice this year. But it sure would be nice to beat up the rich boy with the limo and take his date.