American Pie 3 had some fun gags, but what really bothered me is that they made Stifler even more annoying. Like, he was annoying in his own way in the first two films, but he still felt somewhat relatable and felt like a character. But in the third movie (and going forward) they pushed it to the max, and he played the character differently. That high pitched laugh, being even more crazy than before, to me it had the similar effect of over-acting. He was funny in the first two because he felt naturally crazy, but then it felt like he was trying too hard to be crazy, and it wasn't fun anymore.