A childhood belief about eyes

For the longest time, I used to believe an odd thing about sleep crusties (the bits of dead skin that build up in the corners of your eyes, yano)
I would tell myself every night, not to rub them out in the morning, because I believed that if you left it long enough, the crusties would build up in a mold of you eye. I thought it would be so cool to have a crusty mold of my eye (??). Of course, I was weak and never accomplished this feat ;)