... and now it works! I bought a bouncer off of craigslist and I brought batteries and a screw driver to make sure it worked (the toy bar and vibrating part) and it didn't. We bought it anyway since DS really likes being bounced and I was desperate. So we get home, I clean it up, try the batteries again, still a no go. Then about 2 hours later, we're sitting here, one of our cats walks by it to investigate and it starts vibrating. Now it works. Do I have a magic cat or what? I'm so excited.