My most irritating mistake concerns the use of x, the repetition operator.
my $multiple_Zs = 7 x 'Z'; ##Wrong
my $multiple_Zs = 'Z' x 7; ##Correct
I'm not sure but I guess this has something to do with that English is not my first language. I think the natives read it as "Z times 7" and then is DWIMs. In Swedish it spoken the other way around. But all in all, this is one of only a few cases where Perl NDWIM.
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