It might be meant to be a harmless joke but try doing them to somebody in Ukraine or Alma Ata who has just awakened and pretty much in a bad mood because he/she is late. You get into trouble, man. I remember putting a classmate who just awakened, in ridicule. What happened? He challenged me into a fist fight! I was a weakling then. So I got beaten badly. His name is ... . ..., how are you there in California now..