Dude... didn't you see how effective that double (triple?) chin was at keeping him strapped in?
He would be a big smashed blue berry if it wasn't for that chin
Now you're just being dumb... sarcasm or not.
To answer your original question and to expound upon what feddoc said:
For the T-2 (and Prowler, I think), optimal aircrew weight is between 140 and 204 lbs. Lighter than 140, the eggheads have determined the the forces exerted on your body can be extremely harmful.. too light and you can't absorb/sustain the Gs.
Above 204, the seat isn't guaranteed to be 0-0.. meaning you may or may not be able to eject safely on the ground should the need arise... not enough height to allow for complete chute deployment and/or not enough falling time to slow you down enough.
And as a second note, you're strapped into the seat alot more securely that that kid was into his. You wear harness that is fit to your body, and the harness straps into the seat at 4 points (at least it does in the T-2 and T-6).
And oh by the way, being a fatass makes it alot harder to get into the plane and strap in.
So based on that, explain to me how being fatter makes an ejection seat safer?