Penis prank on April Fools' Day

Today is April Fools' Day and I'm going to trick my girlfriend with my own created penis prank. I've thought of something really perveted to finally trick my girlfriend the way she deserves. She's looking forward to a relaxing evening together in front of the TV and she has no idea why the camera is on the table. She also doesn't know anything about the prepared chip can. So we're lying comfortably on the couch in front of the TV, with her, clueless in my arms. I wonder what's going to happen when she suddenly feels my cock in the can.