A lot people make the mistake of using a bottle that doesn't cover the entire sphincter.
The trick is to use a bottle that covers the entire rim, so you don't lose any fart upon entry. Once the fart enters the bottle you've got a few seconds to screw the top on as the fart won't escape that quickly.
(, Thu 4 Dec 2014, 14:43, Reply)
Also. Squeeze the bottle beforehand.
In a technique similar to the egg yolk separator
(
MyFrontFellOff ; his mouth full of teddies, urinating defiantly, Thu 4 Dec 2014, 14:59,
Reply)
That's a method I'm not too fond of
As the suction often brings out unwanted turd embers
(, Thu 4 Dec 2014, 15:29, Reply)