For example, he had to disguise himselg in a ridiculous way or he did something funny or embarrising
133819
well, once he got possessed by a flea demon who was in love with myoga and caused him to act, uh, WEIRD. there was a time where he and miroku finally got a dip in the hot spring and jaken tried to steal the tetsusaiga, and inuyasha stood up so fast h got dizzy and fell over, kagome came running the way he always does cause she hears yelling,  just as he fell over anime style with his legs up in the air and ummmm, you get the picture. there was also this gay guy in the band of seven who was always hitting on him. \nyeah, all in all, inuyasha has had many a embarrassing situation.
95896
More than likely, he may have become "excited." If not that, then he probably was embarassed. One way or another, he was feeling very strong emotion; whether it was good or bad, I don't know.
416174
try explaining to him that it was a joke + the im might have gotten messed up or he could have missunderstood it.
192471
sarcasim and able to joke around.
321031
sometimes its just fun to act like something that you are not, its harmless and it is also a stress reliever.
561819
They have problems either expressing their emotions or showing them too much.
529361
Yes. Perot almost pulled it off. He kept the other two clowns somewhat honest.
135525
he probably has taken for granted what he has at home. maybe it was a younger woman who made him feel sexy and attractive.whatever the reason he was stupid.
35221
okay, so play him up a bit maybe ignor him a little bit until he thinks he screwed up something good then see if HE wants to go hang out at the movie or something when you resloved the "fake mad at you scheme"
340609
He flipped you off and then told you "whatever" with the W.  Guys are immature, and guys I know do it all the time, they are just joking, but sometimes it can be hurtful.
487803
I am in with those who think he picked up the accent over time. To say he put on the dog and fakes it is not nice at all. A strong accent like in Scottland can really take someone over, like an evil spirit. Not it always happens, but certainly can.
143485
He went under surgey.
122277
one of his personalitys might, but they might be the problem too
246289
if it really annoys you, you can tell him to stop (doubt it will work) or take him for who he is and get to know him around the clowniness.
540680
i think he's funny, but he says some stupid stuff sometimes
617935
Yes, it is impersonating someone
197677
Probably somethin he made up just to annoy you