Keep your Perl looking sexy and avoid them at all costs

my %hash;

my $string='123132877\'863246234*^&*@#^$^@#%$#%@$@';

$hash{neverUseQuotes} = 1;

$hash{$string} = 1;

$hash{q(This is a dumb key)} = 1;
[download]

The exception: back quotes

@hash{`find nits`} = 1;
[download]

Possibly just idiosyncratic from the way you learn it first