"Vertical drinking" is something encouraged by a lot of City pubs: drinking standing up, probably in a cavernous pub crammed to bursting point. Pubs where this is the policy have hardly any furniture in order to allow as large a crowd of people as possible to get inside. I think it's supposed to be enjoyed by "young people".
Personally speaking I find this to be a noxious practice, as it makes intimacy very difficult (you're squashed in a crowd of people who are all talking at the same time, and probably yelling to be heard above the music) and it's uncomfortable and tiring. Also, I really dislike having people push past or jam their elbows into me for hours on end, but your mileage may vary. --Earle
From the pub's point of view, vertical drinking tends to be great news -- you have nowhere to put your drink down, due to the lack of tables, so you always have it in your hand. Once it's in your hand, you're more likely to drink it faster, and so to buy more. Profit 1, Customer Satisfaction 0. --Jimbo