There's no such thing as a happy ginger?

I was told this was a "gingers only" row in our dynamics lecture today. This photo was the second attempt, as none of them looked very happy in the first one, to which Fergus (far right) told me "there's no such thing as a happy ginger"!

All my hand-ins for this week are handed in, but my History of Science short essay deadline is looming ever closer, so I'd better get on and do some reading.