I love the pranks from Just for Laughs because the prankee always ends up laughing after finding out it’s a prank. Here’s a compilation of some Halloween ones they’ve done.
Of course, some of these are not practical for you but hopefully they’ll give you an idea of a fun prank.
People become nose blind to their perfumes and deoderants so they put on more and more over time to smell the same (from their perspective). My mom has the same issue but claims it’s all in my head.