4) Half/Half scarves
Created purely for the purpose of making money. It’s utterly ridiculous that these exist for the most part. I have to admit, when there is a positive connection between the two clubs and it’s a momentous occasion, these things can be a half-decent souvenir to have as long as you don’t wear it in public (Liverpool vs Borussia Dortmund for example), but overall, half and half scarves are a joke.