'I could feel my tongue going a bit numb': McDonald's has served cleaning fluid to customers more than once

A pregnant Alberta woman isn't the only customer who has sipped a McDonald's coffee to find it was actually cleaning fluid, CBC News has learned.
Read more: http://www.cbc.ca/news/canada/calgary/mcdonalds-cleaner-latte-mccafe-southern-alberta-1.4771198?source=Snapzu