40th President: Ronald Reagan, 1981
Rose = 40 (Regan was the 40th president)
Ray gun = Regan
Buffet = 981 = 1981 became president
Ronald McDonald = Ronald
The rose (40) on the table changed when the ray gun (Reagan) was fired at it. It turned into a buffet (981=1981).
Connect Regan to Ronald
But when the ray gun (Reagan) was used on the president it turned him into Ronald McDonald.
NOTE: The way Mammoth Memory remembers Ronald is to think of Ronald McDonald.