An interesting phenomenon, something that I've never seen or heard of called the "Kaye effect" is apparently quite common with certain liquids like soap. When poured onto a surface, the down-going stream suddenly throw up a jet that swirls, then merges with the incoming stream.

The only reason we don't see it is because generally it's over in an instant. Anyhow, I thought it was pretty neat and will probably be wasting a bottle of dishsoap just to see if I can get a glimpse of it.

Click the link above for more info and a slowed down video clip.