Mac does have a wild side to him, the creators even said so. I remember Craig or someone at the Foster's section at Comic Con this year (saw this on youtube), was asked how someone as sweet as Mac could create such a on and off jackass like Bloo.
They said that Mac has "a little bit of Bloo" in him. Mac has a wild side and he can be just as crazy, crafty, wacky, and naughty as Bloo can. Mac's shown this in "Bye Bye Nerdy", "Squeeze the day", "Neighbor Pains", "Partying is such Sweet Soiree" and the AWFUL (in my opinion) "Only have surprise for you".
Mac's a great kid and I think it's even greater that he has a bit of a nutty and wild side to him just like Bloo does. The good thing is, Mac at least knows how to hold it in more so then Bloo does.
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