Close Encounters of the Asher-kind

Little Boy,

Something very odd has been happening around the house.  And it's been happening with alarming frequency. I've been discovering lines of cars - in all sorts of places and at all sorts of hours.

What on earth could be causing this strange phenomenon?!  Is it aliens trying to send me a message?  Is it mischievous gnomes playing a prank on me?  What on earth could it be?  Well, I planned an elaborate trap to find out - namely, I got out my camera and waited for the next sighting.  I think the pictures I took are very telling.
Exhibit B
I don't know about you, but I see a trend here! I think I know who's responsible for the lines of cars.  In fact, I was quick enough with the camera, that I actually got a picture of myself with the culprit!
Now the only question that remain is: What does it all mean?

Love,
Mom

Aliens are invading!

Helping Mom sift through
the evidence

I know whodunit!  But
I'll never tell!