Descartes wrote:
And by headphones, I'm talking about the ones on iPods and MP3s, not the ones on CD players. Anyway, I always have a hard time getting headphones to fit inside my ears. Whenever I put them in they pop out a few seconds later. I'm guessing it's because my ears are so small, but I don't know. Does anybody have any idea why this happens?
By headphones you mean earphones.
You've got poorly designed earphones, or poorly designed earholes
. It's most likely the former. I suggest inner ear (noise cancellation) earphones. They plug into your earhole, and so don't fall out.
I got a cheap pair of earphones once after I lost a bud for my better ones, and found this problem. They were made of soft plastic, and so I carved them into a slightly more ergonomic shape with a craft knife. It helped until I got another pair of buds.