... I'm sure there are myriad traditions; much as in various cultures we have the occasionally sad but usually good natured habit of "teasing" some group as the brunt of jokes ... it used to be various ethnic peoples, then it was "blonde" jokes, etc....
So, who is the programmer's target? I mean, like (warning: golden oldies....):
Q: What's five yards long with an IQ of 500?
A: Fifty Perl programmers in the unemployment line....
or :
Did you hear about the ASP programmer who won an Olympic gold medal? He took it home and had it bronzed....