my SN came from many attemps at making a Yahoo name many many years ago,
went something like this...
1) PeterG (already used)
2) Peter2 (i always use 2) (already used)
3) PeterG2 (already used)
4) PeterG22 (already used) then Yahoo sugester 3 different SN'* so i picked this one thuse...
5) PeterG22000 was selected and then for conveniance i used it for everything that needed a SN
I think there might have been more but i cant quit remember because its been 8 years since then