Out of curiosity: Do you know whether the $1 is listed as "available funds"? Some (all?) banks list pending transactions like check deposits and include those funds in your account total, but then have a separate header for "available funds" that are actually usable to spend or move.
In my bank (Capital One 360, formerly ING Direct) the deposit is listed as cleared & available. The $1 I sent him back is in a pending status (and thus removed from my available balance)
