Fatto matematico: 818 is the number of ways to dissect a 12-gon using non-crossing diagonals into polygons with an even number of sides.
Trivia: 818 is an unremarkable number.
Data storica: March 28th is the day in 845 that Paris is sacked by Viking raiders, probably under Ragnar Lodbrok, who collects a huge ransom in exchange for leaving.