This rather revolting looking thing was in my son's Christmas stocking.
It's a squishy ball in a net and when you squeeze it tightly bits of the
ball pop themselves through the holes in the net and also change colour! Magic!

I find it very theraputic when I'm stuck in the house with a gaggle of
fighting kids, it's raining outside and we've got a whole week of half
term to get through.... There's something very satisfying about squashing
that ball...hard!

Thanks to Katie Jones, who reminded me these balls liked to be squished! http://www.pbase.com/jones16/image/74168930

Post script... I squeezed it so hard ... it's broken & all this orange
squishy stuff has come out ... ew...better find another means of stress relief!