Donald Trump lets Jimmy Fallon wreck his hair on 'Tonight Show'

Things got a little messy for Jimmy Fallon during his interview with Donald Trump.

The "Tonight Show" host managed to achieve what no other individual has publicly accomplished: He messed with The Donald’s signature coif.

“The next time I see you, you could be the president of the United States,” Fallon noted in his wind-up to asking if he could do something to Trump “that’s just not presidential.”

“Can I mess your hair up?” Fallon said to massive audience cheers and applause.

Trump grimaced and shook his head at the idea before relenting a few seconds later.

Fallon then went nuts, wildly flipping his hand back-and-forth through Trump’s bouffant hairdo.

Trump smiled throughout it all. Afterward, he modestly, and unsuccessfully, tried to put his locks back in place.

RELATED: Dr. Oz says Trump is 'healthy enough to be president'

In a previous appearance on "The Tonight Show," Trump participated in a skit where he appeared to interview "himself." In reality, he looked through a mirror to see Fallon, sporting a Trump wig and mimicking his trademark gesticulations.