Imagine things are just going great. Maybe the world is at peace; there are no warring factions. Everybody gets along and there is No Poverty or disease or anything else that sucks. Then some asshole has to come along and ruin it for everybody else.
This is why we can't have nice things.
You've probably heard your mother say this once or twice. This Stock Phrase turns up whenever clumsiness or [...] [tvtropes.org]