‘Tis a naughty night to swim in.
– William Shakespeare
King Lear, Act 3, Scene 4. The Fool tries to discourage Lear from the mad act of stripping off his clothes in the raging storm. He is concerned that the aged monarch is getting drenched and needs to takes shelter. The fuller quote: "Prithee, nuncle, be contented; ’tis a naughty night to swim in."