A suicide will be nice and neat. What if I don't?

Lead poisoning.

What about the police, Biff?

They're going to match up the bullet with that gun.

Kid, I own the police!

Besides, they couldn't match up the bullet that killed your old man.

You son of a...

I suppose it's poetic justice:

two McFlys with the same gun.

Idiot.

What the hell?

Nice shot, Doc.

You're not gonna believe this. We gotta go back to 1955.

I don't believe it.