Now and then, an ugly incident provides a reminder of the potential for abuse.

There were some ugly incidents a couple of hundred years ago.

One positive result of the ugly incident was it had made him appreciate his own mother.

And then that ugly little incident to spoil it all!

There have been a few ugly incidents that got wide publicity.

But there were no ugly incidents - before the game or during it.

And they definitely had the potential to cause ugly diplomatic incidents.

"Now, let's all get some sleep and forget this ugly incident."

Instead, it was a loss marred by an ugly incident.

An ugly incident as he drove her home enlightened him a little.