A child's eyes rolling back in her head is not a normal occurrence.

It could be a quite normal, although rare, occurrence.

Under the particular shooting pressures of that film, this seemed a normal occurrence.

Many homes have docks in the summer as fishing and swimming are a normal occurrence.

The two boys tell the story matter-of-factually as if these things are normal occurrences.

However, that Repairman wished to speak with him was no normal occurrence.

Yet if alarms were a normal occurrence, perhaps violence would not be necessary.

It is a normal occurrence to see them soar over the lake and dive down to make a catch.

After all, to be blunt, crime is a fairly normal occurrence throughout the history of Russia.

I mean, is this a normal, everyday occurrence in your life such that you wouldn't remember it?