I just trapped two mice in a glue trap. How do I kill them humanely?

This picture is just a visual example of what I have on my plate. Its the actual mice I trapped.

upload.wikimedia.org/.../...by_David_Shankbone.jpg

I was thinking about taking em outside and throwing a rock at its head.
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The rodents are dead, I drowned them
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OMG there's a fourth one!! I can hear that mofo!
I just trapped two mice in a glue trap. How do I kill them humanely?
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