Sure, but you already forgot what you were taught, apparently, so why worry about that?

Hey man, (Hey, man, ...) now you're starting to get a little bit out of line. I've always used my apostrophes correctly when it comes to possessives or contractions. These false accusations are going to hurt my reputation. I used apostrophes on two words that otherwise could have been unclear with a trailing 's', like wfaulk said. It's a loophole or an exception. Someone could have thought 'Iraqis' was something more like 'marquis', or they could have thought 'apostrophes' was 'apostrophess', which would not make any sense.