Hmm.

4:21 PM PT -- A SOURCE WHO HAS SPOKEN WITH A MEMBER OF THE SECRET SERVICE TELL TMZ, TRUMP WAS NOT HIT BY A BULLET. RATHER, A BULLET HIT HIS TELEPROMPTER AND THE GLASS STRUCK HIM BY THE EAR.

kagis

According to CBS, Trump apparently posted that his ear was hit by a bullet, but I suppose that he might also not have known what hit him:

https://www.cbsnews.com/news/trump-says-shots-pierced-injured-ear-rally-pennsylvania/

The presumptive Republican nominee said he heard "a whizzing sound, shots, and immediately felt the bullet ripping through the skin." It's not yet clear whether Trump was hit by a bullet or shrapnel, but blood was strewn across his ear and face as Secret Service agents ushered him offstage.

"I want to thank The United States Secret Service, and all of Law Enforcement, for their rapid response on the shooting that just took place in Butler, Pennsylvania," Trump wrote on his social media platform, Truth Social. "Most importantly, I want to extend my condolences to the family of the person at the Rally who was killed, and also to the family of another person that was badly injured. It is incredible that such an act can take place in our Country. Nothing is known at this time about the shooter, who is now dead. I was shot with a bullet that pierced the upper part of my right ear. I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin. Much bleeding took place, so I realized then what was happening. GOD BLESS AMERICA!"

Back when Reagan was shot, he didn't even think that he'd been shot, was ticked off at the Secret Service guy who threw him into the car, thought that the guy had broken one of his ribs.

EDIT: Though Teddy Roosevelt knew:

https://en.wikipedia.org/wiki/Attempted_assassination_of_Theodore_Roosevelt

Schrank did shoot Roosevelt, but the bullet lodged in Roosevelt's chest only after hitting both his steel eyeglass case and a 50-page copy of his speech titled "Progressive Cause Greater Than Any Individual", which he was carrying in his jacket pocket. As onlookers gasped and screamed, Elbert E. Martin, one of Roosevelt's secretaries and an ex-football player, was the first to react, leaping at Schrank, wrestling him to the ground and seizing his gun.[8] A. O. Girard, a former Rough Rider and bodyguard of the ex-president, and several policemen were upon Schrank at the same moment. Roosevelt stumbled, but straightened himself, and again raised his hat, with a reassuring smile upon his face. His aide, Harry Cochems, asked Roosevelt if he was hit, and Roosevelt simply said assuredly, "He pinked me, Harry."[9]

Roosevelt, as an experienced hunter and anatomist, correctly concluded that since he was not coughing blood, the bullet had not reached his lung, and he declined suggestions to go to the hospital immediately. Instead, he delivered his scheduled speech with blood seeping into his shirt.[11][12] He spoke for 50 minutes before completing his speech and accepting medical attention. His opening comments to the gathered crowd were, "Ladies and gentlemen, I don't know whether you fully understand that I have just been shot, but it takes more than that to kill a Bull Moose."[13][14][15]