The owner of a Florida restaurant was left scratching his head when he discovered in his cash register a dollar bill signed by four astronauts. According to a local media report, Rob Buffaloe made the odd find earlier this month at his eatery BurgerRobs in the city of Titusville. "We were counting out our banks for the evening, and as I'm sitting there doing my thing, it caught my eye," he explained, "I knew it wasn't an ordinary bill." What drew Buffaloe's attention was a set of signatures that he later determined to be from a group of astronauts who flew on a space shuttle mission back in 1988.

Specifically, Hoot Gibson, Bill Shepard, Jerry Ross, and Mike Mullane had signed the dollar bill at some point in the past. The men were four of the five crew members aboard NASA's STS-27 mission, which was the second space shuttle launch after the Challenger tragedy. Spellbound by the stunning find, Buffaloe contacted the American Space Museum, which also happens to be in Titusville, and confirmed that the signatures were genuine. "I was flabbergasted," director Mark Marquette recalled of the moment he heard about the dollar discovered at BurgerRobs.

How the incredibly unique piece of space history wound up in the cash register at the restaurant is mystery. For his part, Buffaloe theorized that the astronauts "thought it'd be fun to just sign this dollar bill. I imagine it circled the globe and made its way back home." To that end, no one has come forward claiming to have lost the remarkable memorabilia, meaning it very well may have been in circulation for years with no one recognizing its significance until now.