There are a lot of reasons not to be a huge dick when ordering anything in public, the main one obviously being that acting like a dick doesn't actually accomplish anything. This week anyone visiting a Pret a Manger has an extra incentive not to be a bastard, because the company is giving out 300,000 vouchers for free hot drinks - the clincher being that it's up to the staff to decide who gets them.
The promotion started yesterday, and is running until this Sunday (25th March), and is part of the company's "Make Someone Smile Campaign". It's kind of like a pay-it-forward situation without having to part with any extra cash, with Pret encouraging anyone receiving a voucher to pass it on as a "random act of kindness". Seeing as how cold it is at the moment, it might be a good idea to pass it onto a homeless person since they could do with something hot. Or you could pass it onto a colleague, or keep it for yourself. If you get a free voucher it belongs to do, so you can do whatever you like with it.
The voucher can be redeemed against any barista prepared drink, hot or cold, and you have until the 30th April to redeem it. After that it'll be too late, and you'll be kicking yourself for leaving it in your wallet for so long.
Sadly the promotion won't be happening at every single one of the chain's branches. So you're going to need extra helpings of luck to be able to find a participating branch and then wangle yourself a voucher to redeem in the future. But if you're heading in for a coffee anyway, it might end up being a nice surprise.
Update: The original version of this story said the promotion was London only, but Pret has been in touch to confirm it's actually nationwide