well, there's signalling and ... nod, nod, wink, wink, "I haven't said this , but..."
In the good old days I used to "drop by" the office of one of my competitors "just for a cup of coffee" and well, goodness me, blow me down with a feather, just about ALL of my different competitors had also "just droppped in for a coffee".
The weird thing was that when I got back to the office, well, darn, I seem to have lost my current secret pricelist, but hey! where did all these competitor's secret pricelists come from???
Of course I am just joking, this sort of thing never went on AT ALL and it is exactly the sort of sneaky underhand thing that I frown on severely.