My dad, unfortunately, passed away when we couldn’t remember his blood type...
His last words to us were, “Be positive!”
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Explanation
Explain Bear
Listen up, dummy! This is a dad joke. The dude's dad needed a blood transfusion, but they forgot what type he was! Right before he croaked, he told them to "be positive!" which is a pun because "be positive" can mean be optimistic, but also, his blood type could have been type B positive, type A positive, or type O positive. I bet you eat tide pods.