So Doug every Mac made before this year seem to have been made with a DVD drive in it and those DVD drives were slot loaded, not trays. So DVD's could get stuck in them. I have heard stories about people not being able to get DVD's out of the drive. Are there some tricks to make this easier?
First try the standard things
1. Try the eject button on your keyboard
2. Right click on the disk on your desktop and choose the eject from the menu
Then try these
1. Try restarting the Mac and after the chime press and hold down the left mouse button (or left corner on your touch pad) and see if that gets the disk to eject.
2. Next I would check the disk utility program and select the disk there and see if you can select the eject menu option.
3. If that doesn't work I have heard people tilt and shake the Mac and sometimes the disk falls out.
4. I guess the next thing I might be doing is throwing it against the wall but you really don't want to do that.
5. If none of the above works try this: Open the Terminal application in your Utilities folder. At the prompt enter or paste the following: "/usr/bin/drutil eject" and click enter. The disk should eject.
6. If this fails then try this, boot the computer into single-user mode by holding down (Command)⌘ -S through the boot process. At the prompt enter "/usr/bin/drutil eject". The disk should eject. To restart the computer enter "reboot" at the prompt or "shutdown".
If it is still stuck you may have to take a trip to the Apple store and I am sure they can resolve the problem.