Marketing alcohol brands in bar setting is a delightful task, because generally your audience is quite willing to hear your proposition.
One of the smartest gimmicks I have encountered was in Divine Bar. When you order a wine bottle, “a wine fairy” goes to fetch the bottle with cable. The whole order was part of performance. It definitely got our group to order bottle of wine instead of just having regular pints. Actually they could even up the ante by placing the most expensive wines the highest to encourage even more splurging:

“Wine Fairy” reaching for the bottle in the middle of the picture (sorry for the blurry picture, it was a blurry night)
The following Budweiser activation is a brilliant idea merging together promotion to sell more beer and providing actual value to the consumer:
Budweiser – Bud Jukebox from Bruno de Carvalho Barbosa on Vimeo.
Insight: Choosing a beer in bar setting is quite arbitrary. You either choose what is on the tap or go with the best promotion. How could you do the beer promotion so it would have a little bit more idea on it? What value could you provide which goes beyond traditional discount?
Jukeboxes are social glue in bars. There are always people who want to play some music and also pay for it. What if you could have jukebox, which works with only Budweiser beer caps? Would you select Budweiser instead of Miller to get that “currency”?
The idea is just perfect for the bar setting: fun, simple and relevant for the product. Not to mention increasing sales of the product. I love ideas where you turn a neglected part of the product (this time beer cap) to something valuable.