We have a family friend who has no children of his own and a gift for picking out the most annoying toy within a 50 mile radius. He once brought home a doll from Chinatown in NYC; it was a super-cheap plastic doll torso and the bottom was a hoop-skirt type thing. When anyone made any noise, it would play the begining of that Aqua song "I'm a Barbie girl, in a Barbie world! I'm a Barbie girl, in a Barbie world!" very loudly over and over again while it "danced". Of course, my niece loved it. Luckily, her younger sister (the Elizabeast of the Apocalypse) destroyed it on one of her rampages. That was definately among the most horrible toys I had to live with.
This same friend also mailed a toy called "Harvey Megillah"; another dancing doll, only he danced to Hava Nagillah and the music got faster and faster as you went along. He was easier to turn off, but once the batteries started to die it got really awful.
He also bought my niece a puppy that barked and flipped and was super annoying the 350 millionth time...
Then there was the bouncing Tigger-- my sister bought that one..
And the Evil Easter Bunny. My sister thought it was cute, and brought it home for her daughters. "Easter bunny! Easter bunny he go hop! Hop! Hop!" Very loud, super obnoxious, and difficult to turn off. My nieces' father put it on top of a shelf that no one else can reach. :LOL :LOL :LOL
Not one of these toys has made its way to my Elibean. SIL, who is a classic old maid, also has a gift for picking out the worlds most annoying toys. I pointed this out to her at my baby shower (where she presented my nieces with frog-shaped keychains that made horribly creepy "ribbit" noises and could not be turned off). She was very proud of it, and personally enjoys them, buying herself one new loud and annoying toy each year at x-mas (this year, it was singing dogs; one sang in words while the other two barked.

: )
Early on, she saw how Eli was terrified of overstimulating, loud toys and I was very pleased to see that for his first birthday, she bought him a truck that was not only age appropriate and sturdily constructed but battery free.

When she discovered that part of it can be a dump truck and it can be opened, she asked before she gave it to him if I thought it'd be safe for his little fingers

. So even though she likes those obnoxious toys for herself, I'm confident that she'll ask Mike or myself before she purchases anything like that for our kids. Hooray for considerate people!