How do you explain closures?
btilly: I have been in this position, and what I've found is that formal definitions don't make sense.  You have to encounter an example that makes you sit up and realize that something is going on that you don't know.Two examples where I tried to induce that kind of brain lock in Perl programmers are http://www.perlmonks.org/index.pl?node_id=34786 and http://www.perlmonks.org/index.pl?node_id=50132.