Hearing this woman say "Wercome back," and then list the names of her patrons at the end of her videos. I watch her videos so much that I sometimes memorize the names of her patrons and start to list them along with her as she says them. It's so satisfying.
The noise of electric motors starting and revving up. When you listen closely, every model has its own characteristic startup sound, even those of identical construction. I especially like the cooker hood in my father's kitchen, which sounds a bit like a spaceship taking off.
Me and my brother both really like the smell of a brand new game case, or a freshly delivered Lego Magazine (I've got a huge backlog in a bin and every time I open it, it is just MMMM god-tier sniffin')