I have had a bit of a calamity with a # 8 anchor and screw. There is a big hole in the wall. However I think a distracting cover with a seashell may take care of it.

Some very excitable bloke in the hardware shop insisted the wall would fall down with my shelving technique. To temper his excitement I decided to upgrade to the #8.

Note to self: do not listen to excitable males.