853906 is one of the more unusually packaged sets that LEGO has produced recently. It's a cross between a card and a polybag-sized set that's been designed to be given instead of a traditional card, or maybe for kids to give to attendees of their birthday party, perhaps with a thank you note written on it.
There was a similar set released last year, 5004931, but this one is much more colourful and appealing.
The packaging looks like a box that's been flattened at one end.
The outer wrapper is removed to reveal a very colourful box showing balloons and presents.
It can be opened out and flattened to reveal more party-themed graphics.
The set's 40 LEGO parts are inside a small polythene bag which suggests that they are not packaged in one of LEGO's usual factories.
Among them is one minifigure, which comes with two heads and two hairpieces, enabling the builder to mix-and-match.
The main build consists of a small plinth with a stud shooter mounted on top.
The centres of the balloons can be pressed out of the backing card which turns them into shooting targets.
Good luck trying to get the 1x1 plates through the holes, it's harder than it looks!
A small present and rollerskates round out the set.
For its intended purpose, it's a great idea and is likely to be well received by its recipient.
However, there's nothing in it to make it worth the effort of tracking it down unless, like me, you're a collector of the unusual.
The set and its predecessor are currently available from shop.LEGO.com for £3.99 and $4.99:
You might also find it in your local brand store.
If you have a kids' party coming up it might be worth stocking up!