That scares my heart!

John had shot some sticky arrows onto his bedroom ceiling and wanted to get them down, so he stacked a box on top of a bench and was standing on top of that with a sword trying to hit them. When I saw him and that the box was less than an inch away from falling off the bench I told him to be careful because the box could fall off and he might fall all the way to the floor. John looked at me with wide eyes and said in a very serious voice, "Mom, don't tell me that, that scares my heart!" Then continued to stare at me with wide eyes as he put his hand on his tummy. Oh man, sometimes he just cracks up!