You people are being unfair to the President, it was the Secret Service which made the decision to not allow the President to handle his own umbrella.
This photo shows some of the terror and confusion involved in the President's early attempt to perform his own umbrella duties, after this event the Secret Service gave training to the President, but eventually decided that it was best to just keep umbrellas from him for the duration of his Presidency.
Oops, I posted that on the wrong thread.
On this thread I meant to post that Sammy Davis could do a lot of trick handling of a six shooter, and he displayed that skill when he would appear on “The Rifleman”.