You know you're an adult when......you buy a house.

From PV31W:

Shopping for a house is fun.
Buying a house is not fun.

Envisioning one's stuff in the purchased house is fun.
Actually moving the stuff is not fun.

Dreaming of decorating a house is fun.
Actually handing over the cash required is not fun.

Getting a paycheck is fun.
Working for the Man is, well, not so much fun...