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in reply to Stupid mistakes I repeatedly make

I haven't actually done this one yet, but I have seen others do it, and like yawning, it almost seems contageous at times (I've caught myself on the verge of doing it):
my $some_scalar, @some_array, %some_hash, $and_so_on;
It's the kind of habit that makes people want to just comment out the "use strict" line, or delete it entirely, before they get accustomed to it.