An old Play School craft episode, in which the hosts appear to be making a homemade bong, is giving Australian adults a bit of a giggle.

The craft segment from 2013 which went viral this week, shows host Alex Papps making a small hole in a plastic bottle, inserting a straw and sealing around the straw with blu-tack.

Co-host Rachael Coopes then fills the bottle with water in a process that may seem familiar to many a cannabis enthusiast.

Social media has leapt on the footage:

Why is this Play School host making a bong? via @justipen pic.twitter.com/SluCGzBdiF — Osman Faruqi (@oz_f) October 8, 2015

Anyway, Alex Papps made a bong on Play School today. pic.twitter.com/hHS310AWsl — Wasted Adulthood (@CeadaoinsChild) October 7, 2015

Is that a bong on Play School? pic.twitter.com/7L0rbtkMh5 — vegemiteblonde (@vegemiteblonde) March 11, 2015

Reddit users also delighted in the footage. One user declared "Ok. Time for an ABC inquiry. They're making bongs on Play School", while another user posted "There's a cone in there..."