Aformal presentation can lead to miscommunication when:

Who can translate this tá an-deacair ag an ngaeilge

Which of the following is an assertive statement? whatever you want to do is fine by me. i see your point, but i still think the other solution is more effective. well, that may not be the best idea, but we could try it. that will never work. just think about it.

What is the longest word in the world? this is grammar.