$ perl -Mdiagnostics -e " rand()->menu "
Can't call method "menu" without a package or object reference at -e line 1 (#1)
    (F) You used the syntax of a method call, but the slot filled by the
    object reference or package name contains an expression that returns a
    defined value which is neither an object reference nor a package name.
    Something like this will reproduce the error:

        $BADREF = 42;
        process $BADREF 1,2,3;
        $BADREF->process(1,2,3);

Uncaught exception from user code:
        Can't call method "menu" without a package or object reference at -e line 1.
 at -e line 1.