Works every time! As well as when other people yawn and you feel an overwelming urge to do the same but worry they'll think you're a parrot or something...I'm extra tired at the moment though because I've just finished a weeks lambing in the countryside.*Yawn*
I can also yawn on demand, I yawn when I think of yawning, I yawn when somone says Yawn or yawn has been written down... I yawned 3 times since writing this, make that 4..
There is something strangely satisfying about a yawn though isnt there!?! (5)
5 YAWNS!!!!!!!!!!! Crap it...