"Mission control we are at 4 percent oxygen and dropping, please advise," one astronaut says in a panic.
"Mission control is not here right now, but can I take a message?" the janitor replied.
The astronaut, in a rage, asked the janitor to clarify his statement.
"Well this is awkward, but government has shut down," the janitor said. "It turns out, I'm the only essential employee in the place.
"But I could have told you that months ago."