Anti-pattern: try { doStuff() callback(); } catch (error) { callback(error); }

When errors are thrown by the callback being invoked as can be seen here...

https://github.com/couchbase/couchnode/blob/v2.2.2/lib/clustermgr.js#L160-L166

... the callback will be called again, with the error it threw. IMHO, user land callbacks should not be called from a try-block. As discussed on IRC with Brett.