Guinness Bullet?

Ok what is the blastic Missle thingy in the bottom of a Guinness Draught bottle?

Good times to be had…

http://www.straightdope.com/columns/000526.html

I might add that at the time of the article, Guinness didn’t have the chargers in bottles, only cans, so Cecil was correct.

For the record; it used to be the case that four-packs of bottled guinness were supplied with a little plastic syringe - the stout would be poured and then the syringe would be used to repeatedly suck up and squirt out a small amount of the stuff, creating the head.

I’ve never seen that. When were they around?
It sounds like it might work, but I can see why they kept researching. The widget solves the problem in a much neater way.

It would have been the late seventies/early eighties when I saw them in use at one of my parents’ parties…

Can’t find an online image of them, but it wasn’t just an ordinary syringe; the plunger and the sides had plastic rings that the fingers and thumb fit through, so that it could be operated with a single hand - the nozzle was (I think) a ring of fine holes around the circumference of the end.