Several weeks ago, I noticed that my kids were saying "look it" whenever they wanted someone to look at something. Since that is such bad grammer, I pointed out that "lookit" isn't a word, and now we are all making an effort to use better grammer. Now that we are aware of it, we notice how much other people say it.
Kaylee is trying to educate the other students in her Kindergarten class. Everytime someone says it, she lets them know it isn't a word. Then when she comes home from school, she gives us a full report on everyone who said "lookit" in her class, and lets us know that she is trying to fix the problem....LOL.