the odd occasion BrE
the odd moment BrE
the odd day BrE

My father wasn't a smoker, and must have collected those cigarettes on odd occasions, for years.

And then on the odd occasion you do, there's always the feeling they have half an eye out for an upgrade.

And the showers, after games, were known, on the odd occasion, to have a drop or two of hot water.

Maybe it has crossed my mind on the very odd occasion.

On the odd occasion, the two step out to a wedding reception, a school play, or a restaurant together.

You might even on the odd occasion, go a whole week without making a sale.

After the war, except the odd occasion, he wasn't the stroke player that he was.

On the odd occasion, I've even been known to change my mind!

He'd caught her out on the odd occasion, ties that seemed pointless and without any motive.

Not on the odd occasion, but each time they took this fit.