This is something you might want to consider next time you order that venti double-shot caramel iced cappuccino.
Ice samples from three major takeaway coffee chains in the UK have been found to contain bacteria from faeces, according to a BBC investigation.
Various levels of bacteria were found in samples of iced drinks from popular chains Starbucks, Costa Coffee and Caffe Nero.
Three out of 10 samples tested at both Starbucks and Caffe Nero contained the bacteria called faecal coliforms.
Tony Lewis, from the Chartered Institute of Environmental Health, said these kinds of bacteria were "opportunistic pathogens - the source of human disease".
All three chains affected said they have now taken action, with Starbucks adding it is now conducting its own investigation into the claims.
A UK spokesman said the chain took hygiene "extremely seriously".