Whenever Finn encounters something that smells like it might be food

[conuly]

and he doesn't want to eat it right now, he diligently tries to bury it using his nose. It's amazingly endearing, even when the context is "I just spilled my lunch, can you leave it alone so I can clean it up?"

Right now I have a bag of onions sitting on my bed and here he is, nosing the blanket over them.