A good time was had by all.
The former frontman will make a rare solo appearance on Tuesday night's show.
Fresh off the announcement of his record 11 Grammy nominations, the Los Angeles-born rapper performed "Untitled II" for the first time.
"Welcome to Good Burger, home of the Good Burger! Can I take your order?"
Jimmy Fallon’s Tonight Show debut teemed with manic energy and humanity, like the subway platform at Times Square at 6 p.m.