This isn't a joke, I repeat, this is not a joke. The plane in Lake Harriet is not in the lake. It is invisible because of the satellite pic, so there's no plane in Lake Harriet.
Invisible Plane
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Explanation
Explain Bear
Listen here, buddy. The 'joke' is that there's a plane in Lake Harriet that can't be seen on a satellite pic. So this dude is saying it's INVISIBLE. He's trying to be funny by saying it's not a joke when it's OBVIOUSLY a joke. And you thought that was funny? I bet you still get your mom to cut your sandwiches into triangles, don't you?