murrayn:   ikegami beat me to it, but some other examples:

c:\@Work\Perl\monks>perl -wMstrict -le
"print qq{\x01} & 1;
 print  qq{\cA} & 1;
 print qq{\x31} & 1;
 print      '1' & 1;
"
Argument "^A" isn't numeric in bitwise and (&) at -e line 1.
0
Argument "^A" isn't numeric in bitwise and (&) at -e line 1.
0
1
1
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