Two Chinese men and 'suspicious liquid' spark air alert

Here's an intriguing little story.

A US-bound Delta Air Lines flight turned back to Japan after two Chinese passengers locked themselves in a toilet with what authorities said was a container of suspicious liquid.

The pilot of the Boeing 747-400 with 407 passengers and crew bound for Minneapolis turned around three hours into the flight from Tokyo after the two men refused to leave the toilet.

The pair, both in their 20s, had boarded the flight during an earlier stop in Shanghai.

So the question must be: What was the liquid that two Chinese men would want to take into a toilet? Would anyone care to guess?

Story: Hong Kong Standard