My ps3 plays all dvds apart from one???/:?

I was watching a DVD and it finished so I went to put in disk 2, it makes the loading sound then about a minute later it makes the sound of ejecting the disc but the disc don t come out until I press the button? I tried the disc in my dads DVD player and it works fine, I tried the next disc in the ps3 and works fine it won t play that one disc?/:

Anyone got any idea why this is happening?