The following table contains part of the information for a single instance.

A single instance of a female carrying eggs in her mouth has also been reported.

Look here, I'll give you a single instance: they all wanted to marry me!

In all but a single instance had it been overlooked and no change made.

And for the life of me I can't remember a single instance where such a thing has come to pass.

He thought back through his three days here, tried to find a single instance in which he'd been entirely alone.

We might say, "There's not a single instance of a car having a bad tire."

In this single instance, there were not many others to choose from.

Is it a single instance that turns them, or a series of events?

In a way I think that single instance would have satisfied me.