Considering right before he landed on your burger or potato salad he was sitting on sht or something dead.....
www.mentalfloss.com
This is why I'm not a big fan of eating outdoors.

What Happens When a Fly Lands on Your Food?
How gross does it get once that fly takes a swan-dive into your bowl of soup? You probably don’t want to know the answer.

This is why I'm not a big fan of eating outdoors.