Is this common

[AP]

This has been a fun thread to read. 

In conclusion: 

1. If a professor asks for your paper in electronic form, just send it. 
2. If a professor asks for your paper in electronic form and you want to know why, just ask him/her.
3. If you don't want to send it for any reason, don't send it and deal with the consequences.
4. If you are not ready to deal with people's mistakes with a click, then move to Mars.