Amanda Seyfried is enjoying single mom life — one prank at a time. Seyfried, 40, took to Instagram on Tuesday, October 6, to share a hilarious video featuring her daughter, Nina, scaring her half to death. In the clip, the actress strummed a dulcimer while singing a cover of Joni Mitchell’s “A Case of You.” Nina, 9, silently snuck up on Seyfried while wearing a Ghostface mask from the beloved Scream franchise. The mischievous youngster got closer and closer to her mom, until Seyfried noticed her reflection in the camera. I response, the actress gasped, screamed and leaned b...