Cheese/ham-filled lettuce. Good Housekeeping, August 1961. At 8:05 p.m., test subject "lettuce A" went mad and committed ritual suicide. Here is the grisly aftermath. As you can see, his brain contained high levels of Cheddar, known to cause dementia in the iceberg species. The Lab Techs pronounced him ... delicious (?). haha ALL humor credit goes to Holly GoLightly!