Fifty years from now, your grandchildren, sitting at your knee, will look up and say "Where were you when the Spice Girls reunited at the 2012 London Olympics?"
Okay, your grandchildren will not actually do that. In fact, by that point the Spice Girls may be utterly indistinguishable in collective memory from the Destiny's Child, TLC and Pussycat Dolls. That's why you will gather 'round the young-uns and show them all the Spice Girls music videos that YouTube has to offer.
Wannabe, an instant classic, which is recently occurred to me might be a song about orgasms:
2 Become 1, in which the Girls croon at various locations around pre-9/11 New York City:
Spice Up Your Life, which imagined the Girls as alien invaders careening through New York City in a spaceship:
The utterly forgettable song Say You'll Be There, featuring Posh writhing in a skintight black catsuit:
Stop, which is also completely forgettable, but has the the craziest eye makeup I've ever seen:
And last but not least, Viva Forever, yet another utterly forgettable Spice Girls song about pixies that nonetheless has gotten chosen as the name of their forthcoming musical in London's West End:
Brace yourselves for this evening. It's going to be epic. Your future grandchildren are counting on you.