Not Felony Manacing? Read this: http://www.colorado-criminal-lawyer.com/felony_cases/menacing.html
According to this information, just standing there can get you arrested, prosecuted, and convicted of Felony Manacing.
I especially love this:
"Believe it or not, it is not even necessary for the person to be aware of the threat! You can be found guilty of menacing a sleeping person. The District Attorney would have to prove that you knew that your actions, if discovered (if the person woke up), would place the person in fear."