Johnny Manziel spent his Thursday night pounding champagne in a hot Miami nightclub -- a bizarre way to spend the night hours after officials announced his domestic violence case was going to a grand jury.
TMZ Sports spoke with multiple witnesses (including a staff member) -- and obtained video -- showing the embattled QB drinking straight from what appears to be a champagne bottle at Story nightclub in Miami.
Manziel tried to go semi-incognito in a big hat and sunglasses ... but it's obvious it's Manziel.
Hours before Johnny hit the club, the Dallas PD announced the investigation into allegations Manziel struck Colleen Crowley on Jan.