What is the protocol?

There is a guy that sits at a computer opposite me at work, at lunchtime he goes to various websites and finds things that seem to amuse him, so he chuckles.

My question is this, is the chuckling supposed to be an invitation to ask what is so funny? I would have to get up and walk around some other desks to look at it. Maybe I need to bring my noise-cancelling headphones to work?

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