Have you heard of VI Poo? It's a deodorant that you spray in the toilet to make your shit not stink. The ads hilarious, I thought it was a prank at first.
Lots of everyday things too:
air freshener: why not just clean up the mess instead of covering up the smell with chemicals?
Trash bags: just use grocery bags, the trash won't get as stinky if it is taken out more often, and you aren't buying something just to throw it away
Paper plates: my mom uses these, I don't get it
"Collectibles " of any sort if bought new, it's just a marketing gimmick
Super size fast food meals, unless you are sharing with a friend
SUVs in most circumstances
Already cut up fruit and veg
Leaf blowers
Unnecessarily electric appliances like corkscrews and knives , they don't even save any time