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A robot bin that deposit itself into a larger bin robot that rolls itself to the curb on collection day.

That's what is needed.

But what if the robots become sentient? then we are in trouble

Don't worry, they will probably get bored with the job and kill themselves first.

I suspect foul play, the temptation to push it would too great.

Nope, they say it ran itself into the fountain. However, apparently a toddler has knocked it over before as well.

Wow, are things that bad that even the machines are taking themselves out.