Well lets see.....I remember I put my ancient mew card in my wallet a looonnnggg time ago, and when I took it out had a vertical crease right down the middle

. I didn't even understand this, unless it moved around in my wallet I never put it on the folding part of my wallet. I'm not sure if I still have this or not. There's also the original charizard that my sister gave me when she quit collecting pokemon cards (she stopped about a year before I did). This one I know I still have....and MAN, the paper on the front is peeling off in the bottom left corner! It hasn't 'bent' as other people have pointed out, but man the front paper is incredibly easy to peel off, I haven't touched it a whole lot so fortunately it is still in tact, but it could come off very easily.....I think I have some other holo cards with this problem as well, but charizard is the first one to come to mind obviously since its one of the only ones with good value.
EDIT: Ok it isn't a first edition charizard, it's just a regular holo one, but regardless, it's actually worst than I thought, the paper in bottom left is peeling off, and the top two corners are being held together with tape

. Pretty bad....I found an original gyarados in a similar condition to the ancient mew (Which I believe now I don't have anymore, I couldn't find it amongst the cards I still have), its just the crease is horizontal not vertical, lots of other cards have bends and such but none really worth noting.