I'd like to watch them, I really would, but there's some paint drying on the wall and I really need to pay attention to that.
Hey, my dry paint is fading and THAT is fascinating.
Oh, can I come, too? I'll bring some beer and we can watch it together.
You are always welcome at my door, but I suggest that you throw your hat in first, just to identify yourself, obviously.
(It is an old west thing about the hat and a kind of joke about you being welcome or not)
Bringing beer allows all manner if not all ilks of visitors passage, all knowing that they are watched. Doubting seriously if an internationally renowned physicist would cause me any harm, especially knowing that he will be watched.
You are welcome at my door.
Now, before we go any farther, we should probably identify your hat.