Odd thing to blank on
Before the Powerbook, I used to have an iBook. I sold it to my mother when I bought the Powerbook. When I gave it to her, I told her it just had a normal CD-ROM drive - no DVD-ROM, no burning, nothing special. I have a Firewire CD-RW, so I didn't feel any need for that stuff when I bought it. Why pay extra?
So, it turns out the iBook has a DVD player after all. I looked under the keyboard (don't ask why, I felt compelled to take it apart) while home last weekend, and saw "DVD" near the inventory tag. She then proved this hypothesis using one of my nieces' DVDs. I must have known that, and simply forgotten. Weird, weird thing to forget, though.