A long time ago a chappy who had the next room to me used to thing it was a bit of a side splitter to turn on your light in the early hours, (light switch by the door), when one was having a kip, and then bugger off. This would obviously turn into a return match with the game sometimes lasting several hours/nights.
One evening this was particularly tedious, so
js devised the 'game set and match' end play. First one has to get into the swing of the match, he turns yours on, you turn it off, turn his on etc. It is important to vary the timing of the returns, to ensure that he goes for the end play! After a suitable number of return serves, ideally about half a dozen or so, so you know he's going to come back, cover your light switch with shaving foam gel. The last thing matey boy is going to expect is to put his hand in something wet/gooey/sticky attatched to the wall in the pitch dark middle of the night. You can usually get a new selection of verbs nouns and assorted slang rearranged in orders you have never heard before. You might also get a bit of a lecture regarding lectricity and fluid, once they've calmed down a bit.