Firstly, Paper can tear easily, if we had 2 Heads, Paper-like & Human-like, even our Paper-like head may tear-up easily!
Secondly, Paper is easily carried away by winds, if we had 2 Heads, Paper-like & Human-like, even our Paper-like head may get carried away!
Thirdly, if we had 2 Heads, Paper-like & Human-like, people may start using our Paper-like Head for writing notes!
Lastly, Paper can easily catch fire, if we had 2 Heads, Paper-like & Human-like, even a small fire may prove to be very risky for us!