Richard Nixon: "I'm not a crook." [1]

Bill Clinton: "I did not have sexual relations with that woman, Ms. Lewinsky." [2]

Donald Trump: let's not even start.

I find it weird that institutions still insist the people they question must swear to tell the truth. It obviously doesn't help. Quite the opposite, it makes the liars look stronger (until they're caught).

[1] https://en.wikipedia.org/wiki/Watergate_scandal

[2] https://en.wikipedia.org/wiki/Clinton%E2%80%93Lewinsky_scand...

*liars

(The spelling’s not logical, just an historical quirk of English)