i can top your story, somewhat.
i was at the 100yds at harvard, shooting at my stuff, then a guy came around, i gave him time to setup while i swapped my rifles, cleaned, prepped mags, wanted to shoot and - did not see my targets.
got VERY confused, and it appeared that the guy unstapled my targets and moved them to the other stand.
![ROFL [rofl] [rofl]](/xen/styles/default/xenforo/smilies.vb/013.gif)
I politely

asked him - dude, did you just move my targets? he got extremely embarrassed - and it was partially on me, as it was one of those days when no one typicaly shows up there at all, so i had 2 stands used - and he thought it was a leftover stuff.
but, it was one of a kind experience.

no ill doing/intent there, though, sometimes it is just an honest mistake, so to say.