By now, you probably know whether you give good presents or bad ones.  The hapless character of this song goes beyond just giving a series of bad presents.  He's completely thoughtless and selfish.  In fact, he's really looking forward to this present reverting to him after his girlfriend finds no practical use for it.  After all, ninja throwing stars are desired by only a few people.  So he gave her a crappy gift intended for himself.  But there are consequences.  I think that he ultimately learns his lesson.  Of course, there was the temptation to have her to use the throwing stars on him, but I just couldn't get the rhymes to work out.  Believe me, I tried.  So instead you get sibling intervention.  And a lesson in gift-giving.