This user uses "data", "media", "memoranda", "criteria", and "agenda" as the plurals of "datum", "medium", "memorandum", "criterion", and "agendum".
its & it's
This user thinks ohh, if you want it to be possessive, it's just i-t-s, but if it's supposed to be a contraction, then it's i-t-apostrophe-s... Scalawag.
their there they're
This user thinks that there are too many people who don’t know that they're worse than their own children at spelling!