This is my MO. If they accept I just put a bite of the dish on their bread plate or main plate.

The thing that has started happening to me more recently though is people offering to share sips of wine / beer when at a happy hour (work people - with friends/family don't really care). Not talking bud light / coors light, but more with the explosion of craft beer being at a place with 50 different types of beer so most are new to people. I think because you have to share the glass (and can't just put it on a plate) it's little bit weirder for me.

I always offer but sometimes I feel bad when others offer and I take them up on it (as if they are just asking as a courtesy).