"Drew Adams" <drew.adams@oracle.com> writes:

> In *scratch*, type this:
> (accessible-keymaps (current-global-map))
>
> Put point somewhere after the sexp and hit `C-u C-x C-e'.
>
> The result sexp inserted is large, and it has a mouse-face property
> over it all. Double-click a left paren somewhere inside the sexp, to
> select a sublist.
>
> The display flashes spasmodically. Very annoying. And you can hardly
> see the region highlight at all.

A more manageable example is:

(number-sequence 1 20)
=> (1 2 3 4 5 6 7 8 9 10 11 12 ...)

Which is displayed this way: