What is he doing with that water bottle?

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This is at the Batu Caves in Kuala Lumpur, Malaysia. There is a long stairway that leads up to the caves. For some reason, monkeys love these stairs. I have been there a few times over the years and they are always there.

Here you can see a monkey playing with a bottle. See previous post for a photo of the monkey showing what he thinks of my personality.