Plan to throw one away, you will anyhow.
I am doing a startup!
Cross-browser testing from your browser!
I have written my fourth book!
Be faster than Larry Wall in the shell!
You're replying to a comment by Tom Legrady.
The inchworm on a stick may do something, but since it duplicates a standard operator, pre-decrement, it isn't very useful.
Your choices are
$b = --$a;
Which is documented in the manual, so everyone should know what it means, and the cryptic and arcane
$b = ~-$a;
I suppose if you enjoy proving your superiority by doing things no one knows, you'll prefer the second. Personally, I prefer to not have my sleep interrupted at 3 am by someone wanting an explanation of weird code in a program that stopped working. There are enough useful and valid Perl idioms that beginners don't know, no need to add an unneccessary one.
(why do I need your e-mail?)
It would be nice if you left your e-mail address. Sometimes I want to send a private message, or just thank for the great comment. Having your e-mail really helps.
I will never ever spam you.
(Your twitter handle, if you have one.)
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