Not every one of us has a Webcam , but at times on messengers like Yahoo Messenger  you need to show your webcam first to be able to see other persons webcam , also it may happen that you have a pre-recorded video that you want to show to your friend ( part of a prank or something ) . Now you have a solution for that 

I have some pretty creative ideas for this software

1. Record your video using your mobile and transfer it to your PC and then play it through this software

2. You can also use it for showing your favorite video song to your friend, without the need of uploading it to Youtube or some file host .

3. You can create Birthday/Anniversary greeting movies using Windows movie maker and play them to your beloved ones .

and yes, possibilities are many , so just try this if you are still Webcam-less ..

Fake Webcam 5.1.0 Broadcast pre-recorded videos on instant messengers while chatting

Fake Webcam – it will broadcast just one movie to all the messengers at once.
Stream/play videos and movies on Yahoo, MSN, AOL, Paltalk, ICQ, Camfrog, and on all messengers instead of actual Webcam. It stream videos and movies on your messenger just like an actual webcam.
You don’t need to have a webcam for webcamming. Enjoy pretending someone you want to be. Your chat mate will never figure out that it’s not a real webcam.