Chrome Easter Egg or Bug?

If you have one or more tabs open in overview and pinch from the top of a tab (so your finger is on the top of a tab and thumb somewhere below) and then at the same time swipe both finger and thumb up (a pinch and swipe at the same time) all the tabs will disappear.
I also noticed if you hold the top of a tab into position you can swipe the the other tabs down and out the way. Is it a bug of that feature or maybe the first part of an Easter egg?