Best one I've been involved in was a group of us on a mates farm .. owner, not just tenant farmer ..
Messing about in a hole and a couple of JCB'd hills and some pillock comes across on a quad-bike, we'd seen the tracks crossing a field, with a couple of his mates on 'crossers.
He pulls up in high dudgeon, "WTF you f'ers doing here, get orf moi laaaand" etc .. We just peed ourselves laughing and he went ballistic, but instead of actually fighting or kicking our Landies, he was stood on the guad, and stamped on the front mudguard of it, which promptly and quite unexpectedly snapped it, tipping him to the ground and making him then fall forward over the handlebars and drag his leg back up through and over the broken guard ... 'course we were sympathetic .. NOT!!
Then mate comes across in his Manitou, and the quad rider goes quiet .. despite the gash in his thigh ..
We made them get off the bikes and quad and push them the correct way off the land, via 'proper' tracks ... about three miles as the tracks are direct for the farm, but not for the housing estate
They weren't best pleased.