Send in 8 tear off tops from Maltesers, Minstrels, M&Ms or Revels pouches and get 2 free tickets for any Cineworld (except West End) or Movie House cinema to be used Monday-Thursday before the 31/12/2006.
Not sure if this is the best price, but the whole range is available 2 for £2.20 at Tesco, so that's 8 for £8.80. Even when you add on the price of a couple of stamps that's cheaper than most cinema tickets (less than £4.75 per person) PLUS you get a lot of choclates in resealable packets! There's no limit per person or household so as long as you live near a Cineworld (or Movie House in NI) this makes more sense than buying cinema tickets.
I'm sending mine off today, I'll report back with how quickly they arrive.
Asda are apparently doing 2 for £2.00.