Watched the film Trolls last night and a thought occurred to me the that Justin Trousersnake must have had some contact with an Eriba Troll as the overall gist was that;
All Trolls are HAPPY
All Trolls are COLOURFUL
All Trolls (or occupants) MUST HUG EVERY 30 Minutes
All Trolls SING AT THE DROP OF A HAT

I'm sure it says this somewhere in the handbook!!!!!