It turns into a joke. After a jigsaw cutted Zegras YG in UD1 hobby last year, I pulled an Owen Power YG out of a mega with a long line in the glossy coating on the back. Not sure how I'll claim it to UD, it doesn't show on a hi-res scan, but you can't miss it looking at the reflection of the card under a good light.
My kids will get Pokemon cards for Christmas.