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Watch: Gronkowski brothers play flip cup with A-Rod on 'Shark Tank'

Sports Illustrated/Twitter

Any time you have all five Gronkowski brothers in one room together, hilarity is sure to ensue.

Gordie Jr., Dan, Glenn, and New England Patriots tight end Rob Gronkowski joined brother Chris on Sunday's episode of "Shark Tank" to help pitch his product Ice Shaker, an insulated water bottle and shaker cup that can hold ice for up to 30 hours.

Before the negotiations got underway, the brothers challenged Alex Rodriguez and the rest of the sharks to a game of flip cup.

Chris was seeking a $100,000 investment for a 10-percent stake in Ice Shaker, but ended up agreeing to a combined offer of $150,000 for 15 percent from Rodriquez and Mark Cuban.

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