How do you open a watermelon?

I've just got a watermelon but being welsh I'm not used to exotic fruit. I've googled it but I'm confused so as usual I'm going to rely on you lot.

How do you open a watermelon?

I have a gadget
I use a knife
I wrap elastic bands around it
I use my legs
I have too much time on my hands
I give it to granny
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How do you open a watermelon?
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