Ever wish that a someone would "get hit where it hurts most"? Does everyone have a different place? Where is yours?

Where is pumpkin's? He is so sensitive about everything and anything 24/7 it's hard to say anything that doesn't set him off and "hurt him where it hurts most".

Gut or arse?

Ego
Physical appearance
Intellectual acumen of lack thereof
Mental stability or lack thereof

Where d'ya s'pose pumpkin is most sensitive?