The president is walking out of the White House and heading to his limo
when a possible assassin steps forward and aims a gun.
A secret service agent new on the job shouts "Micky Mouse".
This startles the would be assassin and he is captured.
Later the secret serviceman’s boss takes him aside and asks,
"What the hell made you shout Micky Mouse".
Blushing the agent replies
"I got nervous, I meant to shout, Donald Duck!”