Today Prof. K. told me that he considered 13 an unlucky number. He sounded only half joking. “You’re a mathematician, for —- sake, how can you say such nonsense!” – I wanted to shout at him, but instead I just groaned involuntarily and did a facepalm.
I don’t want to be to harsh on K., he’s old and more than a little bit senile, but still.
At the moment I am trying to develop some more advanced superstitions, more befitting a mathematician, such as ’11-dimensional Banach spaces bring bad luck’ or ‘eating food shaped like a sphere with 4 handles will make your teeth fall out’. With enough luck I’ll make them catch on.