Creepy Insect Thing

I know, real detailed title eh.

ok, now that was weird. I was out front of the house on the deck. when I came in I could swear that a black insect, looked like a wasp but several inches long, flew in at the corner of the door near my feet. the dog didn't see it and I saw nothing moving in the room. i know my eyes play tricks on me, especially these days, but that was just creepy. A wasp would make perfect sense, as it was over twenty degrees today, but it is now eleven at night. The other thing is that I did not see anything inside the door after it closed nor on the deck when I looked out the window.