Absolutely Bananas has "5 reasons why EVERYONE should know how to Photoshop their head onto someone else's body." Reason number four:
4. Because you wouldn't want your children to know THE TRUTH about how you spent your younger years (knitting and sipping tea? Come ON!) With Photoshop, your history is yours for the making! Goodbye boring momma, hello fab new me!
Includes a link to a Photoshop tutorial. Link -via Look at This
I used to always cringe when I lived at school when I'd see kids using Microsoft Paint to try and put someone's head on someone else's body. You can still see a lot of it in Facebook groups and stuff. It's all jagged and there's still so much background in it.
I used to aspire to holding "Photoshop Your friends Face on the Oddly Shaped Person's Body" classes in my dorm hall. But I could never get enough signatures.
That's the problem I guess, without sounding elitist, that people think it's easy to do and act like they're masters after one day of learning the program. Sure it's easy to grasp the basics, but you'll be spending considerable time if you want to make something that actually looks good and believable.