Matthew McConaughey Reveals the Very Good Reason He Never Goes by 'Matt' -- See What He Said!

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Matthew McConaughey learned from a very young age to listen to his mother.

The Gold star appeared on Tuesday's Jimmy Kimmel Show, where he shared that he doesn't answer to Matt, and revealed why.

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"It's always been Matthew, for good reason," the 47-year-old actor explained. "I was in kindergarten -- my mom's a kindergarten teacher -- my buddy, John Griffith, says, 'Hey, Matt! Wanna go play out on the monkey bars?' I ran out and say, 'Yeah.' And all of a sudden I feel this hand on my shoulder."

That hand was his mother!

"She goes, 'Don't you ever answer to Matt again. I named you Matthew from the Bible,'" he shared. "So if anyone calls me Matt today... Mom, could be there, in any corner."

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Can't really have a much better reason than that!

Watch Matthew's hilarious story below.

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Meanwhile, McConaughey also opened up about his nearly 50-pound weight gain on Kimmel, which he also expanded on to ET recently.

Watch the video below to see what he said.

Gold arrives in theaters on Jan. 27.

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