Good, Cheap Fast - pick two

There are several instances of pick any two out of three:

Intelligence, Integrity, and Communist Party membership (old Soviet joke)

Completeness, Countability, and no Isolated Points (Baire Category).

Liberty, Fairness, and Equality: people are different, so, in a fair system, some people will earn more; if the system is free, they will bequeath their wealth to their children, which will make the system unfair.

Prosperity, Democracy, and Sovereignty: there is no prosperity without free trade, which requires either negotiating treaties with other countries (and, since free trade benefits everyone a little but bites some special interests, democracies find it hard to negotiate free trade deals, cf. TPP and NAFTA), or surrendering control over trade to a supra-national body (like EU members lost part of their Sovereignty to the European Commission and States lost theirs when they formed the US).

More interesting examples?