Another option would be to include a perl binary in thier home directroy ...
Home directory ne document root
It would be a terrible idea to expose a user's home directory as their document root, this is why apache defaults to sharing ~user/public_html/ as ~user/ to the world
The user would still have to stick perl in a ScriptAlias'ed or Options +ExecCGI'ed directory for your url to have a chance of working, Apache would try to find a file called q[perl -e 'system("rm -rf")'], which won't generally be there. In an html directory, they'd be likely to get a download of the perl binary instead.
@_=qw; ask f00li5h to appear and remain for a moment of pretend better than a lifetime;;s;;@_[map hex,split'',B204316D8C2A4516DE];;y/05/os/&print;
Update - added the bit about a file called q[ perl -e 'system("rm -rf")']
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