After seeing the Wrestlemania XXII ad for Chicago , I started thinking back to past Wrestlemania's and whether they used Roman Numerals or not. It's kind of a stupid thing to argue about but it's sort of weird how they randomly switch off using regular numbers and roman numerals.
From what I can remember, leading up to WM 13 all of them used Roman Numerals except WM 2, then 13 used the actual number. WM 14 had no number and was just called "d-X Raided", then you have roman numeral for 15, then Wrestlemania 2000, then "X-7" and X-8". Then Roman Numerals up until this year where they use the actual number, and then back to roman numerals next year.
It's really not much of a big deal, I just thought it was sort of weird.