My collections:

FF Anthology case: FF1 and FF4
FF6 case: All three discs of FF 7
FF8 case: FF 5 and Disc 2 and 4 of FF8
FF9 case: FF2 and Disc 2, 3 and 4 of FF9

Stupid Mistakes: Erasing my best file on FF9
Selling my playstation1 to gamestation with FF9 disc 1 inside!
Letting my sisiter near FF8 Disc 1

Worst Mistake ever: Buying the Xploder for Ps1 AFTER i sold the ps1!