I was hunting a weird bug for a very long time and at last found the evil insect in my colleague's code. This instantly drove me totally mad: 
# drop first two arguments
map shift(@ARGV),[0,1];

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I think, some people should be arrested when trying to use map, or even better, prohibited using anything but Java.

P.S. (spoiler) It actually drops only one argument as [0,1] is a list of only one element (which is an arrayref) not two, as one could think.

In reply to map() abuse or child with a chainsaw by kappa

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