Yeah. The only time I've ever shorted a battery is a good example of how risky it is.
I have some 18650 battery trays, like the ones you see in mods, and was using them to experiment with my new oscilloscope. It's much easier to clip wires onto the little legs of the battery tray than the battery themselves.
That was all fine, but I foolishly left the battery in the tray, just lying on my desk. "It's not plugged into anything", I thought.
Later I was probing my new, cheap, Chinese 4-wire ohm reader with the oscilloscope. Suddenly I could smell burning. I freaked out, unclipped everything from the ohm reader, turned off the oscilloscope. I thought I had somehow shorted or blown up the ohm reader.
But I smelt it and it was fine, and not warm either.
Then I looked around and saw the battery holder, against which I had pushed a long screwdriver

I had just pushed it out the way to make room for other stuff.
Slightly melted the battery holder around the legs, but not terminally. I threw the battery straight in the bin without even testing it. Fortunately it was only an EFest, one of my cheapest/worst 18650s.
But thank god it happened while I was there, and I hadn't happen to push the screwdriver or anything else metallic against it and then left the room.
As you say, with those Lipo plugs with pins close together, absolutely anything could short them.
Really daft, schoolboy error on their part.