Elvis' obsession

Three days ago, Elvis discovered that whenever Oliver kicks or punches hard, my tummy would vibrate.  Like a curious little kid, he has been staring at my tummy waiting for Oliver's next big movement.  I felt like a guinea pig being experimented on.  Unfortunately, Oliver has been disappointing him.   So far, Elvis only gets to observe at most one vibration per night. Oliver tends to kick hard after Elvis has given up and went to bed.   Way to go son!!