And three-and-a-half: Beware of "perfectionist syndrome".
Fold it in half and beware of sharp ends when using it, though.
As a lifeguard stalking the cinematic coastline this past half-century (beware of a nostalgist saying half a century rather than 50 years), I've observed film-makers surfing on nouvelles vagues on to our shores: the French, the Germans, the Czechs, the Australians, the New Zealanders have all had their new waves.
He told me, "Some rappers that come to it are fucking gangsters, and at first they're, like, 'What is this?' And then they're, like, 'That was incredible!' " Even if you managed to shake the improv guy at the party, beware: half the people in the bathroom line have probably taken U.C.B. classes, too.
As the administration's defense takes shape, the public should beware of half-truths and artful demagogy.
Scrum-half Webb has to beware of second-season syndrome and we'll see how good he is next year when people know all about him, but he looks quality in the making.
The slopes can be busy with local skiers at weekends, but they are often quiet during the week (beware the busy half-term week at the end of February).
And five-and-a-half: For better or worse, beware of spiked punch.
There are currently seven billion people living on the planet, with just over half in urban areas - but beware the word urban, it has no single definition and can refer to quite small settlements.
Finely chop about half a cup of shelled pistachios, but beware of electric mills — they tend to pulverize the nut meat.
Beware though, some people hate them on the half pipe.
