At unexpected intervals, the characters emit strange, sudden shrieks or fling themselves into the giant aquarium that dominates the living room.

And in "Attempt to Raise Hell" (1974), he devised a little mechanized marionette, a self-portrait, that smashed its head, at unexpected intervals, into a big cast-iron bell.

The flyer lurched suddenly to one side and then back again, rising and falling at unexpected intervals.

Blasts from the automatics came at unexpected intervals.

At unexpected intervals, the Giants greeted her with spontaneous celebrations, honoring her for what she had done; and their warmth brought tears to her eyes.

Sumptuous harmonies and melodies that make their way through unexpected intervals without ever sounding forced.

Karen was an attractive blonde and a committed Christian, with a sly sense of humor that peeked out at unexpected intervals.

Delta Campara was a Cepheid variable star, a rather large and unstable body given to violent bursts of energy at irregular and therefore unexpected intervals.

He had come here at The Shadow's bidding - in response to one of those mysterious communications that came at unexpected intervals.

Every fighting dragon was needed now, what with Thread falling from the Red Star at unexpected intervals.