Ooh, me too! DS2, 13, has changed over the last few weeks into the typical 'angry young man'. Temper can flare over nothing, and instantaneously. He threw a pair of slippers at DS1 the other day, screamed at him at top ropes on his way up the stairs, got in the shower and then started SINGING, ffs, as though nothing had happened!! As others have said, he does apologise later sometimes, and shows me the sensitive, loving young man he still is!! He is similar to mumblechum's Ds too though - nobody understands him, he has no mates, no-one likes him, etc. - been to 5 parties this year though, far more than DS1!!
DS1, 15, on the other hand, can be just basically stroppy, militant and argumentative but it doesn't last. Wouldn't describe him as moody though, it's different from DS2. Always has to have the last word, and tbh 80% of the time I find him funny. He's much more well balanced really, laid back most of the time, doesn't really fall out with people and is just a typical 'lad'.
Love 'em both to bits but they are bloody hard work at times!!