Drake's breakdown when his life falls apart without Josh leading to an embarrassing incident in the science room.
Drake: I need you more than you need me! I need you WAY more than you need me! I'm sorry I made you late for your exam! I'm sorry I ran over your bike! I'm sorry I'm probably the worst brother in the world, and you're way better off without me! I just need you to understand... I'm sorry, Josh. I'm sorry.(leaves)
Josh's reaction when he thinks Walter is cheating.