I’ve got a couple. I’ll try to post the other one later.
When I was first married we had a two bedroom apt. One more bedroom than we needed. In that bedroom were two things - a small sofa and a drafting table. That’s it nothing else. No end table, no boxes, no stacks of dirty clothes… nothing.
I decided to learn to juggle. I got tired of bending over and picking up dropped balls so i got an idea. Juggle over the couch and I’d have less far to bend over. I went into the second bedroom and closed the door and started to juggle. A tossed one a little wild and out of my field of vision. I turned around to pick it up and it was gone. GONE. I looked under, behind, around the couch and the desk. Nada. I called my wife in, we spent the next half hour searching. Never found it.
A year later when we moved I tore the couch apart to put it in the dumpster (and find that damn tennis ball) and it just wasn’t there.
From then on when we couldn’t find something we joked, “it’s probably with the tennis ball”.