PC magazines back in the day. Seeing those hardware ads... beautiful.

I buy food and drink. Sometimes I see ads for such things. I don't think that counts. And I don't think I've been motivated by an ad for decades.

Do movie trailers count? I learned about the Mortal Kombat movie reboots by stumbling upon the Mortal Kombat 2 trailer...

I'm sure there's been a few that have taught me about an interesting product, but nothing comes to mind.