I don't like when people make it obvious that they're tired.  I take it as an insult.  "What, am I too boring for you?  Am I not good enough for you?  You have better things to do?  Why don't you check your watch?  Better yet, why don't you check your cell phone?  Any new messages?  Maybe someone important called you.  Why don't you make it obvious that you're not interested in what's going on around you."  I especially notice this at Bible studies.  I know Bible studies aren't exciting.  And I know you had a busy week and you're really tired.  But hold it in like the rest of us.  When I have to yawn, I try to not even open my mouth.  Sure my face is contorted and my eyes might water a little bit, but it's my way of toughing it out.  And what really kills me is when people not only yawn with no abandon, but when they vocalize it with some sort of audible groan or other noise.  Why don't you just leave?  Let's be honest:  you don't want to be here, so just leave.  Get the heck out.  Or if you're tired, cover your mouth or do something else to hide the fact that you're yawning. #psychology