Up Throw! Up B! is a phrase used by Jonathan when he is using the character Roy in the Super Smash Bros. Brawl mod Project M. Jonathan says this when he is doing exactly that; an up throw into an up b. Roy's up b is called "Blazer," and it consists of Roy igniting the Sword of Seals' blade and rising up into the air while holding it up. Isaac later uses the phrase, because he thinks it is funny. The phrase originated from the combo video "Roy is OP" for Super Smash Bros. 4, where it was actually Down Throw into Up B. Jonathan tested that option and found that it did not work, so he used an up throw instead, finding it more practical.