Have you ever used Perl formats? Tied variables? Symbol-table manipulation? Closures? DESTROY? The Orcish maneuver? wantarray? goto? A custom import? no? A blessed coderef? A glob slot? A localized function? last to exit a calling subroutine? Walked the caller stack? Used a B:: module?

If you don't use at least half of those in your project, should you be using Perl?