How does this happen?! It's as if someone just completely rewrote your characteristics for the sake of creating pointless drama, regardless of everything you've ever said or did before this point!
When Lisa vows sheíll never take a stupid risk ever again, Homer slams the brakes and informs her otherwise, claiming that stupid risks make life worth living, and thatís why he has so many crazy adventures. So yeah, instead of being an average American man who has dramatic and absurd scenarios befall him (which is part of the reason why theyíre funny), now heís Captain Wacky, actively doing stupid things on impulse. Itís astounding how jarring this scene is; even Lisa in-universe seems kind of perturbed by her fatherís statements. Homer loves the thrill of adventure? Homer loves lying on the couch eating himself into a food coma. His whole diatribe is almost like his new mission statement, as from this point on heís pretty much always up to some wacky hijinks, a fractured caricature of his former self.