Boing Boing Writing Contest: Found in Space

Boing Boing is having a 100-word writing contest with the theme "Found in Space." Enter to win an HP media server!

Here's my nano-short story entry:

"What’s this button do?" Royce asks.
"That button ..." (click) "... kills every human being back on Earth." I sigh.
"Err ..." Royce says.
"And you pressed it, didn’t you?"
"How long does it take to work? I mean ... hypothetically speaking. If someone were to press it."
"Anywhere from one second to 130 years, depending on the person."
"Oh. So you don’t really know, do you?"
"Is exploring this alien spacecraft boring you, Royce?"
"Do you think it’s some sort of distress signal?"
"It could be anything." I look up. "Wait, why?"
"Because a dozen others just showed up."