Spirit must have taken the WayBack machine ;)
http://www.spaceflightnow.com/mars/mera/040126spirit.html "Then, as we were getting ready to send the next beep command, the vehicle decided to communicate with us in one of its nominal communications windows at which point we got a little bit of data that had very little information in it. In fact, originally we started to decode it and it was from the year 2053 and we thought 'this is not good!' Eventually we found out the data was corrupted, and we were all cheering at that point because there weren't a lot of scenarios that would put us in 2053 on Mars."