That's not a recognised flotation device

PMSL!

Two teenagers were rescued from the Australian flood waters after they tried to use a blow-up doll as a flotation device. http://www.telegraph.co.uk/news/worldnews/australiaandthepacific/australia/8266015/Australia-floods-teenagers-use-blow-up-doll-as-flotation-device.html

why do they find it so funny when death toll is past 30?

Utter twats. Put all their rescuers lives at risk.