The child proof tops to medicine bottles ( and other bottles) that can't be opened by the elderly or anyone with arthritis in their hands. I curse them every time my mother calls me to go over and open hers ( she's 88 and detests infirmity)

Also Gervase - I take on board your comments about chewing gum, but it is a lot less anti-social than the cigarettes that I smoked before I started chewing.