I could (and do) live without watching TV, so it's a no-vote for me on it.
While I use the internet almost every day, I'd still have to say it's also a no-vote.
I'll admit, I had to put some thought into this before coming up with this answer - hygiene products. From the simplest of toothbrushes, to the stick of Old Spice deodorant ; from toilet paper to shampoo. Without those things, we'd be surrounded by body odor. Therefore, I think those are the best inventions.
Before anyone replies with "Those things aren't an invention.", check out the definition of invention.
Wikipedia said:
in·ven·tion
/inˈvenSHən/
Noun
The action of inventing something, typically a process or device.
Something, typically a process or device, that has been invented.