Ian is known for his unexpected appearances at fellow bands live shows.

Here the unexpected appearance of the enemy was in addition to the terrain difficulties.

Several days later Solomon makes an unexpected appearance on the building site.

He was already deep in thought at the unexpected appearance of the ransom note.

His unexpected appearance here, whatever its cause, boded no good.

But a moment later, he made an unexpected appearance.

The impact of his unexpected appearance could not have been greater.

Those who faced him saw this sudden and unexpected appearance.

The rest - the unexpected appearance of Joe, for instance - had been his imagination.

I am explaining why your friend's unexpected appearances upset you so much.