ACT?

While I am preparing for the ACT this Saturday, I enjoy me some good quality time with friends during study parties. They're quite fun.

However, my head threatens to explode because I have 11 other projects to do. (i count them)

So, during these ACT parties I ponder the fact that
ACT is a word: act.
SAT is a word: sat.
OWL's is a word: owls

SO WHY DO PEOPLE NOT SPELL O-W-L's?
If you find that you have made this terrible mistake of saying "owls" while reading or referring to Harry Potter. I give you a chance (with no punishment of having done so before hand -that's ex post facto law) to correct your ways.

I will now go back to studying.