[nickthegreek]

Most of those can also be done consciously though. Yawning is different. It is more inline with flatulence, crying, or vomiting. Actions that are in many ways, outside of our direct control.

[_factor]

I can yawn on command continuously every few seconds just by thinking about how it feels.

[kobalsky]

I can yawn on command. Rumbling my ears and edging swallowing it triggers a yawn 100% of the time