I am blood type O-positive, which I remember by staying ’optimistic positive.’

Weatherly’s quip hinges on a pun: the blood type “O-positive” becomes a mnemonic for an attitude of “optimistic” positivity. The joke turns a clinical label into a personal motto, suggesting that temperament can be framed as a choice or habit—something you can “remember” to practice. It also plays into a familiar celebrity-interview mode of self-description: offering a light, memorable line that signals upbeat resilience without sounding solemn. The humor works because it collapses biology and psychology into a single phrase, implying that optimism is part identity, part deliberate self-talk.