Donald Trump's hair has been a comedic gold mine for late-night talk show hosts since ... well, pretty much forever.

On Thursday, Jimmy Fallon got to touch it on The Tonight Show.

Fallon asked the Republican presidential nominee — fresh off visiting Dr. Oz and terrifying a little girl in Flint, Michigan — if he could touch his hair.

Trump paused, apologized to the people of New Hampshire (where he was headed next), and finally agreed.

Trump lets Jimmy Fallon mess up his hair https://t.co/yka8oxB6cv https://t.co/3tdWr6x1V4 — CNN Politics (@CNNPolitics) September 16, 2016

And so, Fallon reached out and mussed the candidate's hair, which didn't fly off, come alive, or turn Fallon to dust.

It was a fun, light-hearted moment of television that humanized Trump — which is exactly what some people weren't happy about.

Is anything grosser than being cutesy with Trump? He's an anti-semite and virulent racist, so let's RUFFLE HIS HAIR. https://t.co/jnyO1H6jud — Wendy Molyneux (@WendyMolyneux) September 16, 2016

Jimmy Fallon and Donald Trump are kindred spirits: masters of presentation, and devoid of inner lives. — Jeremy Smith (@mrbeaks) September 16, 2016

We've come a long way from Jon Stewart and Stephen Colbert to @jimmyfallon tousling Donald Trump's hair like he's an amusing ragdoll. — Jay Pinho (@jaypinho) September 16, 2016

Awww Jimmy Fallon ruffled Trump's hair and then goofed around with him for ten minutes. What a funny, adorable response to fascism! — Birdy (@palebirdy) September 16, 2016

Jimmy Fallon: Don't put Trump on TV & treat him like a buddy & muss his hair. It humanizes a monster. Stop it. — Tim O'Donnell (@TimODee16) September 16, 2016

Jimmy Fallon has people play games on The Tonight Show. He should have Trump play Risk and see how quickly he destroys the whole world. — Joseph Scrimshaw (@JosephScrimshaw) September 16, 2016

While Trump seemed like a good sport on the show, he reportedly didn't let members of the press pool photograph his hair afterwards — perhaps because he kind of looked like a Troll doll.

Democratic presidential nominee Hillary Clinton will visit The Tonight Show next week. Chances are Fallon will leave her hair alone.