for once
(idiomatic) For the first time, after many instances to the contrary; in a rare exception to the rule; as an exception to the usual.
For once you must try not to shirk the facts mankind is kept alive by bestial acts. Bertolt Brecht
The Now is indivisible. Completeness, the now, is an absence of the conscious mind to strive to divide that which is indivisible. For once the completeness of things is taken apart it is no longer complete. Bruce Lee
Full twenty times was Peter feared, For once that Peter was respected. William Wordsworth
We love but once, for once only are we perfectly equipped for loving. Cyril Connolly
Was that Will?" she said finally. Henry arched one ginger eyebrow. "Perhaps he's been kidnapped and replaced by an automaton," he suggested. "It seems possible..." For once Charlotte could only find herself in agreement. Cassandra Clare
Why can't we for once have a meeting in Starbucks? Eoin Colfer