I once was in a demo call few months ago with 1 particular CXO of my prospect company. It was just the 2 of us. But he liked the product so much that he said he would like to call his team on the call if I didn't mind. I of course, was all into it as it proved to be a good sign.
In a few mins it was ~50 people on the call. When he said team, I thought his fellow CXOs, but he literally invited the whole company on the call. Out of 140 odd people, around 50 were able to make it on a short notice.
Never have I seen this happen!