Just go in ask "Yes, I would like one of the free promotional BigMacs please!" And at first they will say "Sorry, we don't just give out free big Macs."

But not to worry! Act confused with a stupid look on your face and reach in your back pocket and pull out this ad. Tell em someone was handing them out. When they say no again, immediately start arguing the date. Skip past if its even a valid McDonald's ad in the first place, just go straight to "But it's June 6th, that's today."

If you don't have a free big Mac yet, ask why that particular franchise location doesn't think black lives matters and escalate as appropriate. You'll be sitting pretty with a free big Mac in no time!