An upside down glass on a bottle, hold them together and invert it.
Or am I missing the ‘trick’ bit?
Well, yeah, I thought that was pretty obvious?
A funner trick is to do it on a table with someone’s pint glass and a beer mat. Then, whip out the beer mat…
While I’m not obsessive about what glass my beer gets served in,
If I’m not mistaken that’s a bottle of Duvel, and the Belgians are very particular about their beer being in the right glass. Holidaying in Brussels I once had one in a glass that wouldn’t stand up on its own and came with its own little “test tube holder” type stand to prop it up in. IIRC the Duvel one is a short-stemmed glass a bit like a brandy snifter only with a flared mouth (similar to the Stella ones that crop up here occasionally).