So I have have a freebee for adwords and once in a while I'll display an add in a certain town. I don't usually do adwords but thought I'd use up my remaining credit.
So here's the funny thing. Some complete idiot who perhaps has nothing better to do, has no work or maybe paranoid to local companies, continues to click on my adwords add every time it comes up in a certain town.
Today he or she clicked on my add perhaps 10 times. Two months ago I had the same campaign and also they continued to click on the same add.
The person responsible uses the same PC, browser and operating system but chooses to change their ip address before clicking on my add. :-)
What they don't know is that Google identifies their device and invalidates their clicks.
Therefore I will have another report of invalid clicks despite this moron wasting their time.