I recently was at Five Below, and I was looking at the 'novelty items', and saw a Poker keychain. I apologize that this picture is blurry—I was snapping surreptitiously. Believe me, though, in red letters, on the keychain itself, it asserts that it 'Really works!'. This reminds me of the time I was playing Paranoia with Andrew Sillers GMing, and my character needed some tape, so he wound up with some 'Mostly work!' branded tape.
Looking down the rack, I also found me some Yes-5 that also 'Really works!'.
After my foray at Cinco Less Than, I went to Toys R Us, and was delighted to find a Rubik's mini cube
(It 'really works'.)
Also of note: this picture, itself, is so blurry as to be useless to you. It jogged my memory enough, though, for me to be able to tell you about it. It's a sign for a hearing aid repair shop. The red circle trumpets, 'Most brands!'.