Some ideas...

- take a photo of a street scene and ask, "how do get home?"

- or more generally, "where am I?"

- If I hate reading every ingredient on a menu to check for allergies, why don't I point my phone at the menu and have it tell me what I would like best?

- "what's in this sandwich?"

- take a photo of water, "is this safe to drink?" (maybe realistic with near-IR?)

- "what plant is this?"

- record birdsong, "what species is that?"

- photo of text fragment, "who wrote this and which book is it from?"