I find I do this cause it's funny when others are like "uhh....". Like over New Years Eve my boyfriend came into my work for the first time and of course we kissed at midnight, and when my friends at work came over so I could introduce them I said "This is my brother" Then I was like, juuuust kidding. Lol. It was kinda funny, for a minute. Even though they thought I was a creep.