I haven't seen one of these threads in a while, so I thought I'd revive the old tradition.
Here's some:
You have at least 10 mats for the Playstation in case one breaks.
You steal the panels from the arcade and try to attach it to the playstation so you don't have to play with the controls or buy / use those crappy mats.
The local DDR arcade is now into the bottle water business.
You have, through MAJOR alterations, managed to make your DDR mat at home exactly the same as the one in the arcade... down to the plastic arrow your swiped from your neghbourhood arcade...
You dance on the 2nd side of the machine, while player 1 is playing his own, single player game...
People at the arcade start asking you to change their money instead of going to the operators.
When seeing an attractive woman in high heels, your first thought is, "How can she play in those?"
You see arrows when you close your eyes.
You see arrows regardless of eyes open or closed.
You start doing DDR steps, in the middle of nowhere, regardless of where you are.
You can name any song on any mix, and sing along.
You are in love with one of the DDR background characters, and/or you can name them all.
You only play DDR at the arcade, no other game is interesting enough.
You print out instructions on how to unlock songs on a DDR arcade machine so you can pass it on to your local arcade operator.
When you go to a school dance, you ask if they have any one of 500-odd DDR songs you know. If they don't, you go home and bring your own stereo so you can BREK DOWN!
You actually got that last one.
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Che'samo is my new username. It is synonymous for the entity known as Mr. Finnigan. Class dismissed.
You know you're addicted to DDR when... 
K DOWN!
