I bought an electric toothbrush a few months ago, and for the life of me, I could not find the receipt from the dozens of digital receipts I have in my email.
I asked Siri if she could help me find it, and it took her about 3 seconds to go over at least 30 receipts, check the content of each one (it's a URL), and pinpoint the correct one.
Honestly impressed, and this is exactly what I expect Siri to be able to help me with.