1.  Cat owners often notice that their pet will suddenly and for no apparent reason make a headlong dash through the house.

2.  For no apparent reason he had collided with a car coming in the opposite direction, killing the other driver instantly.

3.  For the moment, there is no apparent reason for Railtrack to be given extra help from the government.

4.  Gang violence can erupt for no apparent reason.

5.  He left suddenly, for no apparent reason.

6.  He played extremely well for several weeks, and then, for no apparent reason, quit the team.

7.  Several calls have been eventually connected but are suddenly dropped by the system for no apparent reason.

8.  Some can undergo terrible problems and not get depressed, while others are depressed for no apparent reason.

9.  Suddenly, and for no apparent reason, he turned his back and walked away.