As I stand in the cramped room, I’m told to shut my eyes and mouth - and then I brace myself for what’s to come.
A flurry of tiny ‘snowflakes’ made from white suds, which quickly cover my hair and coat and leave me recalling my university foam party days.
I’m backstage at London’s St. Martin’s Theatre, where I’ve been allowed into the ‘snow room’ of the record-breaking play The Mousetrap, which celebrates its 70th anniversary tomorrow (November 25).