Remember all that end-of-the-world (pseudo-)hysteria that was going on back in 2012? That corresponded to the Mayan Long Count rolling over from 18.104.22.168.19 to 22.214.171.124.0; i.e. baktun 12 ended and baktun 13 began.
Did the Mayans believe that anything out of the ordinary would actually happen when a new baktun began? The Mayan civilization did live to witness the end of baktun 8 and the start of baktun 9 (c. 435 CE); do any of the extant codices describe anything happening then?