There are as follow:
Does Siri Stand For Seriously?
2.Tell Me a Poem
3. Siri, What Airplanes are Flying Over Me Now?
4. Change my Appointment With Dr. Smith From 11 a.m. to 9 a.m.
5. Do You Support Barrack Obama?
6. Beam Me Up!
7. Post to Facebook Walking Dead is Over and I am Depressed
8. Who Let the Dogs Out?
9. Set a 30 Minute Timer or Wakeup Alarm
10. Siri, I am Tired of Talking
Then check out this video of 50 commands you can try out on Siri (some of the commands are repeats from above):
..And finally, a nice one from Jim Dalrymple: