1.   Alta Vista has a few quirky habits.

2.   That horse had a quirky habit of freezing in his tracks during the post parade, and McGaughey did not want to expose him to the Derby bedlam.

3.   Murray is one of those cheerful nonconformists whose quirky habits border dangerously on the whimsical.

4.   Tastebuds have a quirky habit of giving way to fashionable culinary fads over time.