They can Zap your joy

There are some people that every time you talk to them you know they are only going to talk about negative things. It zaps the peace right out of you as you listen. It's like seeing a mud puddle and choosing whether to walk around it or stepping right in it and getting your shoes all muddy. They may choose to get stuck in the mud but you can choose not to let them drag you into the mud with them. Letting them zap your joy won't help them suddenly be joyful but in an instant they can turn your smile upside down.