He didn't care if his change of subject was obvious.

That was a good opening for a change of subject.

A change of subject in an embassy is always something.

He did not think this was a change of subject.

Time for a change of subject, although she wasn't sure why.

He decided it was time for another change of subject.

As a change of subject, this was not the one she would have chosen.

At this point a change of subject was called for.

He turned, looking about him for a change of subject.

So much for her hope in a change of subject.