On the internet, so the saying goes, nobody knows you're a dog.
Similarly, when a person gives a question-and-answer session on Reddit, but remains anonymous while doing so, it's wise to approach whatever they say with a healthy amount of skepticism.
One such Redditor, who goes by the name Nope_Nope_Nope, recently took part in an 'Ask Me Anything' session claiming to be an employee at sandwich chain Subway.
Among the questions he was posed was how people could get 'free stuff' from Subway.
"Complain," was his advice.
"Look really distressed and disgusted with how they’re making your sandwich. Order something, and take it to your seat, open it…walk back and tell them it’s not made right.
"Nine times out of 10, they’ll just make you a free courtesy sandwich. This won’t work everywhere, but at our store, we’re trained to not argue back and to just give them a second sandwich for free."
As an alternative method, for people who wouldn't feel comfortable making a fuss like that, Nope_Nope_Nope suggests just being nice.
"Start a lot of casual conversation and engage the sandwich artist. Then when he’s ringing you up, look into your wallet and exclaim 'Oh s***, I thought I had more cash! I won’t have enough'…ask him if he can 'hook it up'.
"Again, it’s a gamble, but if you play your cards right, you’ll get a discount of some kind."
While the AMA has garnered a huge amount of attention in recent days among people looking to save money on a sandwich, The Telegraph would never advocate using deceit in an effort to get a freebie.
However, we're all in favour of being nice to the people serving you - and in some cases it really can pay off. At Pret a Manger, for instance, staff will occasionally offer a free latte to customers who stand out from the crowd.
Subway has been approached for comment.