If at the end of the day I have any cash in my wallet (I mostly use my debit card now), I like to arrange it in order of amount, then alphabetically by serial number, and then chronologically by serial number if the first two letters of the serial number are the same.
EX: 2 $1 bills, one with F3490834508, another with F3490834510, and another B2357198374
1 $5
and 2 $10 IK7284927610 and IF4138549284
The 1's would go first, in this order:
B would go first, then the F3490834508, then the last F
Then the 5,
Then the 2 10's in this order:
IF2138549284 then the IK7284927610
My girlfriend thinks that makes me weird... -rolls eyes-