Pissed off security. Some Indian male by thr name of "Adrian" at US terminal A, before the immigration, did a "random" check by forcing me to open my backpack just because I asked some extra questions and I am big. Maybe he just doesn't like Americans. Thrn I had to take my shoes off. Why did I have to go through securoty again,if I already did it in Another Canadian city and this was a layover. Horrible.