What is it with my kids and puke??

We're sitting at Chili's having a nice family dinner. Hope is done and playing with the baby sitting in her infant seat. She goes in for a kiss as she often does and what does Katy do?? She throws up in her face! Literally, Hope starts yelling, "ew ew ewwwwwwwwww!" Stands up and puke is dripping from her nose to her chin! Seriously?? Why do my kids find it hysterical to puke on each other and how the heck is Katy picking up this little family trait so quickly?? Must come from James's side! hehe See Evil Karma for past puking experiences. These are some sick sick kids I'm raising!