I caught these two yesterday.....ahem, shall we say, as Captain Jean-Luc Picard would probably not say, 'engaging'.
I went outside and shouted, like a distraught parent:
"Oi! What the bloody hell do you think you're doing!". The one on top got such a fright, he fell off into the drain and the other one looked at me with such a guilty face I just had to laugh.
Poor little guy probably won't be able to "engage" for a week after the fright you gave him! His sweety will wanna do warp 7, and he'll be at half impulse. Shame on you!