During the last Republican presidential debate in Texas, Donald Trump spoke of his sister, a liberal activist judge who he says would make a “phenomenal" Supreme Court justice, and defended her against criticism she has received "for signing a certain bill"—his words—from the bench. He then said his sister wasn't the only judge who had "signed that bill"; more than one judge had "signed that bill."

If Trump becomes president, it could prove a bit embarrassing if he says something like, "Justice Antonin Scalia was a really terrific judge who did an amazing job of signing bills"—or if Trump says that he has chosen his new nominee to fill Scalia's seat because he or she would make "an incredible bill-signer." (Some might even mistakenly think that Trump has nominated someone to fill his own position, since the Constitution grants bill-signing power to the president.)

To avoid such embarrassment, Trump might want to set aside some time on day-one of his presidency to watch this helpful instructional video, which explains how bills get signed into law (hint: not by judges):