Because simply having the keyboard in front of you and the laptop behind you is just plain impractical.
"Thin piece of board duct-taped to the arm of the chair (with piece of old shirt as base, so no glue gets on the chair) puts the mouse immediately under your hand; the leather glued to the top of the board provides a smooth but low-slip surface for the mouse; and the packing styrofoam from the end of the PC tower (reinforced with duct tape, of course), sits on your lap to put the wireless keyboard at your fingertips."
Your move, carpal tunnel syndrome.
On an unrelated note, we have an update we'd like to share with you about comments.
Beginning on Monday, only registered users will be able to comment on our sites. Once you've registered with us you'll be able to see all of your comments under "My Comments" on your profile. Also, your comments will no longer sit in moderation for quite as long, which allows you to comment more and keep up with the conversation. Of course you'll still be able to comment using your Facebook profile as well.
Stay tuned as we continue to make Cheezburger a happier place!
For more information, check out the Cheezburger Blog.