UMD= Universal Piece of Crap (damn you sony)
If this already hasn't happened to you, then be warned. The casings will pretty much fall apart if not properly taken care of. You'd think that Sony would pack those adorably-sized UMD discs into sturdier casings but no. This first started with my copy of Metal Gear Acid. The front plastic covering (where the UMD logo is) will get pressed into the game disc, preventing it from spinning when in the PSP. And that's not all--the white rims will eventually fall out of place. So basically, the whole UMD casing will fall apart. This happened with my copy of Metal Gear Acid and THUG 2 Remix, rendering both games useless. It's already beginning with my copies of Coded Arms and Lumines. Luckily, none of my UMD movies are falling apart.
Just thought I'd give the "PSP-squad" a heads-up.