How did I get this money at Party?

[Wynton]

Believe it or not, I had no recollection of whether I had an account at Party, or ever deposited money there. So I checked (as I was considering opening an account). I found out I had an account and $100.01 sitting there. Then, when I checked the transaction history it showed the following credits (and nothing else):

date TransType Amount
4/23/04 Lucky Seat selection bonus $100.00
4/12/04 Purchase $.01

Did I really manage to deposit just one cent? And how did this get turned into $100 bonus? Can anyone tell me what happened?