Kai Trump gives off the air of a well-behaved teen on social media, but all bets were off during senior prank day when she gleefully "trashed" her favorite teacher's classroom in a wild graduation stunt, Wonderwall.com can reveal. The 19-year-old shared how she and her fellow students at The Benjamin School made a massive mess of the campus, with Donald Trump's eldest grandchild even signing her name across an educator's desk. Getting Wild on Her Former Classroom Kai Trump tossed a roll of paper towels across the room as part of senior prank day. Kai Trump/YouTube Kai took her 1.