One advantage (and sometimes, drawback) of Perl is that you can do things fast.

sub showargs{ print map {"$_ $_[$_]\n"} 0..$#_}
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Doing things fast often leads to code that other people can't read. So don't assume this is good practice. But it's fun, and for a throwaway script it's acceptable.

An explanation:

map {code} @array runs code on every element of an array, just like a foreach loop. Inside the code block, each element of the array is aliased to $_.

0..$#array creates a list going from 0, to the index of the last element in @array. So 0..$#_ goes from 0 to the last element in @_, which is your array of arguments.

Finally, "$_ $_[$_]" prints first the aliased element, then the corresponding member of @_.

I'm sure some other monks can get this faster (and more obscure....)