What should I do with it?

Throw it away,

Replace it with a bottle of wine.

Before you do anything with it, check the bag for a receipt.

First things first, you should check what condition your condition is in.

So you found an empty paper bag. Eh, congrats.

You're right, I could probably return it. Seems to be in mint condition, not used at all. But I'm not sure if I purchased it separately. It was probably thrown in as an extra with a graphics card or something.

Put it on the neighbours doorstep and set it on fire.

Your mistaken. The phrase is actually "mind in the gutter". In order to fix it you need to find Jesus.

Never mind...

Preamble: A couple of years ago the Uk introduced 5p charge for all plastic bags supplied by major outlets.

Point: The other day I was out for a walk and noticed a plastic bag on the ground. When I looked inside there was a brand new t-shirt with an "I love Steam" logo. It's amazing what some people throw away - those bags are worth 5p!

As for what to do with your brown paper bag, give it to a Steam user to wear as a hat.

In two minds,yeah that computes.

I found my Led Zeppelin record in a brown paper bag.

Well, that joke went down like a lead ballooon...

I just wanted ONE person to get the reference. I love that record.