What really happened here was due to the use of a plastic bag on a toddler’s head. The parents had heard that mayonnaise kills head lice. This is partly true. Mayo will kill a few lice, but it does not kill nits. http://www.boston.com/news/local/massachusetts/2015/02/05/springfield-toddler-dies-during-botched-head-lice-treatment/6UijF7UNKXCjmL7kEBI7mJ/story.html