Get the last parameter with built in bash command

Question

In Bash there are several built in command like !!, !:1, !:* to access respectively last command executed, first argument, or all arguments.

How can I access to the last argument without have to count the number of argument, like typying

ls !:2?

I was expected:

$ one two three
$ ls !:-1
$ ls three

But it return $ ls one two