Fart jokes

I am wondering how a five year old  can go from perfect angel to complete evil in under 1 second? Seriously, isn't this something a pms'ing mom should do instead?  Bug number 1 was playing great with his cousins, sharing, blah blah,,,  In under a second he changed and started being angry, throwing rocks, and talking back in only the infuriating way a five year old can.  Of course, we did the usual time out routine, which doesn't work with bug1 or bug2 for that matter.  After about 35 minutes or so, of course all in front of his cousins and uncle leave because the behavior is scaring the 3 year old cousin, he turns into my angel again.  So this was our conversation about it "bug, why did you get so angry all of a sudden?  If you are angry you can't yell and hit people. Instead go in your room and punch your pillow or scream into your couch. What got you so mad?"  Okay I thought this was very "mommy of me" what I really wanted to say, okay scream was " what the f*** is wrong with you, you ar acting like a spoiled brat and you are driving me nuts not to mention embarassing me in front of the 'perfect children' .  So, bug1's response to my mommy moment... "hey mom, did you smell the fart bug2 just did?"  Okay, now I'm wondering if he understands English at all, or do I need to learn this secret language of 5 year old boys.  I give up.  Hope for the best right?  Then I was thinking... does this ever really end with boys/men?  The not listening at all to words coming out of my mouth?  I teach 13 year old boys all day long.  In fact my classes are 95 percent boy.  I will spend 30 minutes or so discussing, explaining, diagraming, doing hand stands, and of course the one boy will raise his hand and say "so, what are we doing?"  The teacher in me says, " okay student x, you need to listen, I'll be there in a moment to help you out."  Again what I really want to say is " what the f*** is wrong with you, you are acting like a spoiled brat and are driving me nuts... Hmm, same thoughts towards bug1 today.  But, the upside of my boys at age 5 or 13 is they make me laugh and a good fart joke gets them all at any time.