Squirrels
I have a back yard, and a front yard that are under constant siege by squirrels. I've spent money on the audio repellers, the scatter around squirrel repellent, the spray bottle repellent... Useless. They dig up new grass the first day I pull the netting off it.
I bought ten pounds of chili powder, but the best solution so far has been squirt guns. They HATE bring squirted. They now run away as soon as I pop open my blinds to look out. Now, this isn't a perfect solution, because they are still out there from time to time, butt at least they are all irritated by me as I am by them now.
I ordered a super soaker 60 off eBay-- because squirt gun tech had gone waaay backwards since I was a kid. This should be nostalgic and fun... Right now they run to the neighbors tree when they see me, but with added range I'm hoping they will feel like they have to move away.