33rd President: Harry S Truman, 1945
Mime = 33 (Truman was the 33rd president)
True man = Truman
Barrel = 945 = 1945 became president
Hairy = Harry
They all performed a mime (33) of the true man (Truman) with a barrel (1945).
Connect Trueman to Harry
The true man (Truman) had very hairy (Harry) armpits.
NOTE: The way Mammoth Memory remembers Harry is to think Harry is hairy.