Strange Emacs autoloaded library

[a at zeos.net]

> I have removed the files
> menu-bar.el.gz
> menu-bar.elc
> from /usr/local/share/emacs/22.0.50/lisp.
> But load-history variable still shows me
> /usr/local/share/emacs/22.0.50/lisp/menu-bar.elc
> loaded and menu-bar appeared at emacs startup.
> 
> What is this?
> 
> Any other library from /usr/local/share/emacs/22.0.50/lisp/
> does not load being deleted.
> 
> Elisej Babenko

I was wrong with the last thesis:
startup.el.gz
startup.elc
and may be some other libraries behave in the same strange manner.
They are loaded being deleted from /usr/local/share/emacs/22.0.50/lisp/.

My question is the same.