11.   Letterman also introduced one of his trademark Stupid Pet Tricks, featuring Sadie, a dog that chased its tail whenever the audience applauded.

12.   Nerve damage causes infected trout to whirl and chase their tails.

13.   The answer came during a Stupid Pet Tricks segment -- surely the first in Oscar history -- featuring Sadie, a dog that chased its tail.

14.   The NCAA is the big dog that chases its tail.

15.   The whole issue of following through with this admittedly bad idea had me chasing my tail, so to speak.

16.   Watching football and basketball, the top sports programs at Rutgers, is like watching a dog chasing its tail, a dragon chasing an eternal sun.

17.   We were like a dog chasing its tail.

18.   While Bonds chases McGwire, the Dodgers chase their tail.

19.   There seems to be no method to their style of play, just five guys running around like dogs chasing their tails.