break a watermelon.
More about break a watermelon.
Yeah, not that easy - you can't just take one home and break it, sorry.
You gotta buy one from a Farmer's Market, grocery store, roadside vendor, whatever....and once you pay? Throw it on the ground right in front of everyone including the person you paid.
For an added bonus you can say something like 'Can you clean this up?'.
Aye, let your asshole flag fly.