I guess it's not embarrassing, exactly, but I have certainly wasted my share of money on body lotions and perfumes over the years. I just don't wear them and even though I stopped buying lotions at all, I'm still accumulating them via stocking stuffers from well-meaning relatives and hotel lotions that I used once and felt obligated to keep.
My mom got suckered in to the Dead Sea Salt thing from a mall kiosk/pushy vendor - she bought the $$$ kits for herself and me. I did use the cuticle oil once in a while, but yeah, you can get that for way cheaper anywhere else.
She also bought four "Smoothie Makers" off a home shopping network. She kept one (it broke) and gave one to me (it also broke), and then expected me to give the other two as bridal shower gifts or something (oh, and pay her back for them). Er, it was a piece of junk blender that basically could ONLY do smoothies due to its design, so no thanks. Also, you could find them at regular home goods stores for cheaper. I think the last two eventually were donated to Goodwill, unopened.
My worst money management moment was deciding to have my first car's brakes checked out by a chain place - naturally they found all the brakes needed immediately replacement for $$$, and being young and naive, I said Okay. When I got home (leaving my car behind) and called home, my dad was like, they're charging you WHAT?? I called the place right away to tell them to stop, but of course "they had already started so my car would be unsafe if they tried to put it back together now." Funny, the guy then offered me a 10% discount for no reason. I couldn't prove it at the time but I'm pretty sure they didn't do a thing to my brakes since there was no difference in the before and after handling. An expensive way to learn to ALWAYS get a second (or third) opinion about any repairs.