37th President: Richard Nixon, 1969
Mic = 37 (Nixon was the 37th president)
Knickers on = Nixon
Push-up = 969 = 1969 became president
Rich = Richard
The mic (37) was placed in front of the president who had just knickers on (Nixon) while he did a pushup (969).
Connect Nixon to Richard
The reason he kept those knickers on (Nixon) was that his best friend said, "I will make you rich (Richard) if you do because I will become the most famous interviewer ever".
NOTE: The way Mammoth Memory remembers Richard is to think Richard is Rich.