You have at most 15 seconds to thoroughly mix your pasta with the sauce.

Nobody in their right mind would ever let pasta sit without sauce.

Once I had to watch while some people strained the pasta, let it there and then started chatting about something else. They were wondering about why I was going crazy and then they complained the pasta stuck together...

Please, don't let your pasta sit unattended. Also, Barilla is not a particularly good brand of pasta.