Strangely, the number 237 has its partisans, some of whom contribute to this list. See HAKMEM for examples. Personal note: 237 Erskine Avenue in Toronto was the house I lived in as a young (pre-HAKMEM!) child.

Oops, 239, as pointed out by others... (By way of explanation (?), at some point in my childhood we moved next door to 239 Erskine Avenue, after which my memory inexplicably developed a lacuna...) -- Tom Duff. I put bomb in squirrel's briefcase and who gets blown up? Me!