Throw down some drinks at The Mad Hatter bar in Orlando? Check.

Pull the fire alarm, so about 500 students in Tower 1 on the University of Central Florida campus rush outside, together? Done.

Give them hell?

Those three words were the last item of James Oliver Seevakumaran's checklist that he made before, authorities say, he would go out with up to 1,000 rounds of ammunition and start shooting, possibly setting off bombs in the process.

It was not crossed off.

Instead of a mass killing early Monday morning, police reported only one fatality: Seevakumaran.

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