Free as in lunch also exists in anglo culture, with the notable example of There ain't no such thing as a free lunch (TANSTAAFL). The concept of free beer sound

Free as in lunch also exists in anglo culture, with the notable example of There ain't no such thing as a free lunch (TANSTAAFL). The concept of free beer sounds natural because there are multiple contexts where you could potentially expect beer to suddenly become free for whatever reason (someone pays for a round, festivals, college dorms etc.) Free pizza would be a good substitute as well. Some consumables just have associations that aren't completely easy to explain to someone not familiar with them.