Save in a file called 'I will not throw paper airplanes in class.pl' and run. (Will need adaption under *nix!.
#! perl -l
($ENV{XX}+=1e-3)<$]&&print$0=~/\\([^\\]+?).pl$/;exec+qq[perl "$0"]
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
If I understand your problem, I can solve it! Of course, the same can be said for you.