While I agree with the other posters that the food and the fact that you work at goddamn Google are probably the most practical and impressive, I was kind of blown away to learn about the death benefit.
If a Googler dies, all their stock vests immediately, and on top of the (not atypical, I think?) life insurance payout, their surviving spouse continues to get half of the Googler’s salary for the next 10 years. And there’s an additional $1,000/month benefit for any of the Googler’s children.
When I mentioned this benefit to my wife, she cried. She actually cried that the company would do that for her if something happened to me.
The best part? So far, she hasn’t poisoned me! It must be love!