Quick reminder:
Just Say Yo: (Will accepts pills (speed), which Carlton mistakes for vitamin C)
Papa's Got A Brand New Excuse: (Will's father episode)
Bullets over Bel-Air (Will gets shot, then Carlton gets himself a gun for safety)
Although these 3 are very, very hard to pick from because they are all extremely emotionally powerful, I'll have to go with I, Done (Part 2). The final FPOBA episode, man, I cry every time Will says "Im definately gonna miss this place" and then shuts the light off. :(
How bout you guys?