Today, Perl is like
Thinking inside of SheBangs
Next Day, All is changed

Update
Let me apologize in advance for this one. I was trying to capture the feelings of learning perl. I eneded up writing a sucky haiku. I'll leave this as an example of how not to write poetry. It should always be from the heart and you should throw out meter and form when you need to. Here is a better attempt.

I learned about the $! today
Perl is mysterious, with symantics arcane
What characters will I learn of tommorow?

Crulx