Creative ways to grief friend in Minecraft?

My friend killed my dogs when I was sleeping and I want to get back at him. I don't want to grief him with fire lava or tnt since thats no fun I was thinking of boxing his house in with glass and filling it with water and leaveing him a single sponge and furnace to drain it out. Do you know any other creative ways to grief him but not to much so he has to repair it?

One of my favourite ways is to take all their valuables and make them go on a treasure hunt, get creative with your clues and riddles. Even better if you're on voice chat with them as you can hear the process of them figuring it out.

Make hundreds of snowmen in and around his house, takes ages to kill them and clear up all the snow.

Hoppers hidden under his furnaces can be a good one, it'll automatically pull out whatever gets smelted, confusing them

Make a hidden rapid redstone clock (observer clocks are the best) and attach it to doors

If you have access to command blocks, you can use the /playsound command at random intervals to randomly play creeper sounds