This is probably less of a case badassity and more a tale of stupidity, but our phone/internet/cable bill had gradually risen to insane levels.
We never watch TV, but use the internet and phone.
So, I finally called them and slashed our annual bill by $1890.
As I posted in my case study update, trying to make changes like these as FIRE prep.
This savings is the same as investing $37,800 in a 5% CD each year! (Facepunch)