Scariest Hulk Out?
For me, it was in the episode "Married". When David is under hypnosis. David remembers when his wife was killed (he keeps saying, "I couldn't save her"), and becomes The Hulk, while still under hypnosis. The lighting and the mood were just right for that scene and was it ever scary!
XTRO Theme: http://youtu.be/pcEeakcNB0k