The Houston Texans will rue the day they passed on Johnny Manziel ... so will the Raiders and the Cowboys -- because he's going to be a KILLER pro quarterback ... so says Billy Bob Thornton.
The "Friday Night Lights" star -- who's a huge sports fan -- was leaving Tavern in Los Angeles last night when he told us he thinks a lot of people have seriously underestimated the explosive Heisman Trophy winner.
"I wasn't so big on the Johnny Manziel thing when he was in college," Billy Bob says ... "But I think in the pros ... I think he's gonna do better than they think."
Browns fans better hope he's right. Meantime, watch the video (below) and try not to cry.
Billy Bob Thornton
Johnny Manziel Will Be a Beast
... In the NFL
5/14/2014 7:10 AM PDT BY TMZ STAFF
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