'On March 23, 1965, NASA pilot John Young made history when he smuggled a sandwich into space.
The sandwich was corned beef on rye, and it was already two days old when Young whipped it out of his flight suit and took a bite of it two hours into the Gemini 3 mission.
So that’s pretty gross.
“Where did that come from?” Gus Grissom, the mission’s commander, asked his crewmate.
“I brought it with me,” Young replied, somewhat matter of factly. “Let’s see how it tastes. Smells, doesn’t it?” ...'
Read the rest at the link. Grissom (who died less than two years later in the 1967 Apollo 1 fire) didn't make an issue of it, but the matter didn't go over well with Congress and the NASA bigwigs.