@Kiruwka, The timing was an estimate and two minutes was probably an over estimation. This wasn't a normal handshake situation- as in two people meeting and greeting each other. I train people in sales and as part of the training we learn about the handshake. Before I give them any information on the handshake we do a handshake exercise. I get them to stand up and shake hands with the person next to them. They do this then all look at me for further instruction at this point the first persons hands start to gravitate to their face. Sometimes I feel like the others want to but are being subconsciously discrete! I ask them to write down their observations about the handshake- how it felt, what happened, etc. As soon as they sit down and start writing more hands gravitate towards faces- they probably aren't aware that I'm still watching them. Then they finish and look at me for further instruction- at this point, if they haven't already the last of them touch their faces.
I train this almost every second week and it's most often the case! At this stage in training my group have relaxed with each other, warmed to me and are generally having fun, so there aren't usually and uneasy feelings.
On another note- maybe mirror neurons are firing!