"If you even dream of beating me, you’d better wake up and apologize” is a boxer’s taunt that was popularized by Muhammad Ali (1942-2016). Ali said about competitor Joe Frazier (1944-2011) in September 1968:
“If Joe ever dreamed that (beating me—ed.), he’d wake up and apologize.”
Wikipedia: Muhammad Ali
Muhammad Ali (/ɑːˈliː/; born Cassius Marcellus Clay, Jr., January 17, 1942 – June 3, 2016) was an American professional boxer, generally considered one of the greatest heavyweights in the history of the sport. Early in his career, Ali was known for being a controversial and polarizing figure both inside and outside the boxing ring. He was one of the most recognized sports figures of the past 100 years, crowned “Sportsman of the Century” by Sports Illustrated and “Sports Personality of the Century” by the BBC.
20 May 1965, Boston (MA) Traveler, “Clays Alfonse, Gaston,” pg. 37, col. 2:
“Liston beat me? Liston doesn’t dream of beating me. Liston can’t beat me...”
Google News Archive
3 September 1968, The Afro-American (Baltimore, MD), “Ali says he’s a nightmare for Joe Frazier,” pg. 10, col. 3:
PHILADELPHIA—(...) On a visit to the city last week, he was asked about a proposed fight with Frazier. “If Joe ever dreamed that,” said Ali, “he’d wake up and apologize.”
9 January 1969, Omaha (NE) World-Herald, “Clay Boosts Education” (AP), pg. 21, col. 6:
“If Joe Frazier even dreamed he’d beat me, he’d wake up and apologize,” Ali said.
Google News Archive
1 December 1970, Schenectady (NY) Gazette, “Ali Is Talking Like Cassius Clay” by WIll Grimsley (AP), pg. 28, col. 4:
“If Frazier even dreams about beating me, he’d have to wake up and apologize,” Ali said.
“If you even dream of beating me, you’d better wake up and apologize”
Rip to the greatest. @MuhammadAli
11:51 PM - 3 Jun 2016
The New Paper (Singapore)
MUHAMMAD ALI’S GREATEST QUOTES
MUHAMMAD ALI 1942 - 2016
Jun 5, 2016 6:00am
“If you even dream of beating me, you’d better wake up and apologise.”