a friend of mine (she's now 21, has a two month old baby) went to her parents and was like:
"yeah, you won't believe me what happend (with a really dramatic face)-I went over to your car and realized it actually wasn't your car"
and her father was like "what-I thought you were pregnant or something like that"
and than she just said "oh yeah, I am pregnant, I almost forgot-I was so crazy about that car thing".
Her mother almost got a heart attack, her father just laughed and said he likes her way of humor.
My uncle went to my grandma at her birthday "oh, mom, ahm, I had no money to buy you something and was really busy
so I just impregnated my girl and got you a grindchild as a present-happy b-day!"
I think I won't be as funny.