I saw the headline and thought my " one song disco" had been stolen!
Bought a strobe light from eBay (£16) and every now and then when I am either celebrating a small online win, just in the mood or think everyone is being too grumpy I stick it on in the dining room turn off all the lights and make the kids and wife dance to the 'one song disco" at a rather loud level.
They say I am mad but always show their friends the light when they are round - gangham style was a good one at Xmas.
As soon as the song is over its back to whatever they were doing - hence the one song disco.
That,Sir, may i proclaim is absolutely a genius idea.
Although it's a thin line between genius and insanity!!!