Years ago a lady I worked with had a similar experience with her 3 year old in his high chair. He wanted more syrup and she said "Just a minute, I'll be right back." When she walked back in the kitchen he was covered in syrup along with the chair and the tray. His response "I fixy myself" This brought back that story which she told me by way of explaining why she was late for work.
It's funny when grandkids do stuff like this, wasn't funny the first time around.