I find real conversations and events really interesting. Sometimes the mundane and everyday boring stuff is more exciting to draw a little comic from than an elaborate made up story. They don't always have to have a punch line or even an end.
I kept getting these strange phone calls, not like people selling stuff or asking me to take part in a survey, but from this guy who had the wrong number but refused to believe me. He kept calling insisting to speak to his friend and started getting almost angry when I was still just me the tenth time he called. I bet his friend had given him the wrong number just so he would stop calling him. This is one of the conversations, word for word.