You go to a deli every day for lunch. You've eaten all the menu options, but like the ham sandwich the best. You eat this occasionally, off an on, every week, for two or more years running. Sometimes, for reasons you cannot fully explain, this ham sandwich gives you a dire case of the Hershey Squirts.
You are this rare ham sandwich. You're coming is brief, mysterious, and a titanic disaster to everyone in the bathroom.