I can think of a few things that I bought specifically because I saw them in an ad, and they solved a problem I had. The 12-port usb charging hub that I'm usin

I can think of a few things that I bought specifically because I saw them in an ad, and they solved a problem I had. The 12-port usb charging hub that I'm using right now is one. Did I 'know' they existed? I mean, I wasn't surprised, but I'd not used or seen one in the wild, and then it popped up in an Amazon recommendation. Going a few years back, those lithium-ion-based car jump-starters were a genuine surprise for me. I'd only had experience with the much larger, bulkier lead-acid ones. An ad showed me an impossibly tiny & light combo jumpstarter and powerpack, and now there's one in my glovebox. It's been used, too, and I'm glad I had it.