while translating interface to my language I tested
Blender quite hard by doing things that normal user
wouldn't do, because they are kinda like useless. But
they reveal few tiny bugs.
Behold!

navigation in 'browse existing choices...'
..same bug like was reported by someone ;) about
toolbox...
I can use arrow buttons on keyboard to navigate in
pull menu (popup button and button with
tooltip 'browse existing choices...')
but pressing up arrow move highlighting down (and
down .. up).

this bug report is pretty useless because those menus
can be accessed with mouse... i just can't hold
myself not to bugreporting ;-)