"Whenever you're sitting in that chair in your shitty nursing home sucking down jello through a straw, you remember that I put you there you twisted fuck"
Actually, that is an inaccuracy. A child of Bart's age likely wouldn't have the strength to destroy a chair by slamming on their father's head in the bath. And even if they were, the father would be severely injured if not unconscious or dead.
For the first part, I'm sure the furniture was made in the USA, explaining it's shoddy construction.
Secondly, Homer has a built-in football helmet. You could wallop him all day with a surgical 2x4.