I've had many friends over the years, but I've found the following things to be essential if our friendship is going to last.

a video game system
I like to be entertained.

a good stereo
For parties, duh.

some good stuff in the fridge
In case I get hungry.

a Costco membership
I'm not going to pay $45 a year to go buy a jumbo pack of toilet paper when I can just go along with you.