Just how sensitive are our tongues, anyway?

In today's video for the Johnnys' Jr. Channel, the boys of HiHi Jets set themselves to figuring that out with a series of food based challenges. They are each given an item of food with a randomly assigned portion of added flavoring, and must decide amongst themselves who got which version.

The first round is a cup of coffee with no sugar, some sugar, lots of sugar, or salt; while the second round is curry with varying degrees of spice. Can they gauge the right answer from each other's reactions? Watch to find out!