There are many ears listening. Many facts will be taken out of context even when carefully identified. Chewing gum, eating, and other activities with items in the mouth tend to clutter up the clarity of your speech. Avoid angry comments on the air at all costs. Obscene statements are not necessary and are out of place in all communications.
Nothing destroys confidence as much as a bored or weary sounding radio operator.
If you are tired, get a relief operator. During an incident, communications suffers enough confusion without wisecracks and jokes. Amateur Radio may be a hobby to enjoy, but when providing emergency communications you must remember that it is serious business and should be treated as such at all times. Stay off the air unless you are sure you can be of assistance. It does no good to offer advice, assistance, comments or other input to a net unless you can truly provide clarification.