Интересно, существует ли английский эквивалент?

Заранее спасибо

а если серьезно, вот из Берди:
Most of us know the word пух from the expression ни пуха ни пера, which literally means "not a bit of down, nor a single feather," and is said when wishing someone good luck. This as a classic example of Russian superstition: so as not to jinx a hunt, you wish the hunters bad shooting. Lest you think this is one of those odd Russian folk rituals, it's good to recall the standard American wish for good luck: Break a leg!

Said to actors for good luck before they go on stage, especially on an opening nights.

Одна из версий происхождения:

There is a German saying, 'Hals und Beinbruch', meaning 'break your neck and leg', which dates back to at least WWII, as Luftwaffe slang, and is therefore earlier than any known English version. It may be that this is a corruption of the Hebrew blessing, 'hatzlakha u-brakha', meaning 'success and blessing'.

German and Yiddish were commonly used languages of the large Jewish contingent of the US theatre world. We can't be certain of the origin of the phrase, but it's highly likely to have migrated to English from the earlier German and Hebrew versions.

Отрывок из
http://www.gosullivan.com/singerwordsjpn.html

Break a leg is said to actors getting ready to perform on stage, as somone said earlier.