Answer: Tell them you want to spend $5 billion on a train that goes really fast.
Indonesia, as the fourth most populous nation in the world, is bound to have a few clever characters hanging around. And one of them, we find, has been stringing China and Japan along for months with talk of wanting to build a high-speed railway linking Jakarta and Bandung. China and Japan, blinded by the amount of cash to be made - mainly by the politicians bucking for the deal - have been going totally ga-ga over the idea.
It's a scientific fact that you can't think straight when you are going totally ga-ga.