Our combo Squirt pen with Disappearing Ink prank is a great start to any pranksters collection. Just fill up the pen with the included bottle of disappearing ink, squirt someone and watch the fun as they think what they are wearing is ruined. After a few minutes it will disappear. Fun effect and practical joke to play on your family, friends and co-workers. Just not your boss. Fun gift for holidays and birthdays too. Disappearing Ink bottle and Squirt Pen a sure fun way to prank them.