LOL! You sound like my editors. In my job as a utilities analyst, I compile information from both the engineering and financial divisions into comprehensive reports on projects to be sent to State and Federal regulators. I constantly get dinged for the their/there thing when I send my drafts up for review and editing. I understand the difference between the two, I just seem to have some sort of mental block when I'm cranking out a reply or report at top speed.
Just think - "there is a great looking gal across the street but her brothers suck and I think they're knuckle heads so I am not going over to their house." - At least I think that's correct!