I can imagine things like
buttons labelled 'do not press' and the like.
(
Squiggy Alloria makes theme parks.,
Wed 2 Jan 2008, 16:50,
archived)
And children running on moist floors,
with plenty of sharp things lying around... :)
(
kitaro is all, like, "Nifty Biscuits" 'n that...,
Wed 2 Jan 2008, 16:53,
archived)