By DAILY MAIL REPORTER
Snug: This man obviously has a high threshold for unhygienic situations
Most people would only put their head down a toilet basin if they were overcome with the need to vomit.
But now those searching for a way to take 'planking' to a new level of daring are getting an up close view of the U-bend too.
Christened 'plumbking', the practice of using a toilet to capture even crazier poses is catching on with pictures emerging on the internet.
Athletic: Face it, this girl really doesn't mind getting up close and personal with the toilet rim
Strong core: A more customary planking pose using the toilet
One shot shows a man with his head fully inside a toilet bowl, completely upside down, supported only by his shoulders.
In another picture, a girl has her face planted inside the toilet seat while her feet rest against a nearby wall.
Superb form: This man has combined the sink and the toilet in his pose
And in a more conventional planking pose, a young man lies horizontally across the toilet, despite the small confines of the bathroom.
Facebook groups dedicated to the practice have started, with one entitled: 'Realising how drunk you start planking the toilet.'
Wet hair? People usually like to get a wash in the shower
Tight squeeze: It seems toilet plankers make a conscious choice on clothing