One simple rule, don't get charged. Shout it out on mic, but don't type it out. You'll more than likely get charged that way.

A simple two step programme to not get charged:

1. Hear a Charger? Just make sure you don't get charged.

2. See a Charger? That's right, don't get charged.

With these two essential pieces of advice, I can guarantee 100% that you might not get charged.