Was trying to buy nitrous oxide capsules for a handheld espresso machine today in New York. I went to a shop and in my UK-affected speech pattern asked the assistant for “bulbs to use with a whipped cream machine, which look a bit like the CO2 bulbs you’d use with a soda syphon”. After a lot of head shaking and gesticulating, he said “Oh! You mean like the gas cartridges for a seltzer bottle? I think we have those!”
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