For a while I've thought that one of the most useful of all possible Transformers would be one that turns into a double stroller (once you have two or more kids, you'll understand), but Ron Tajima has topped that concept. His prototype is built into a beer can. Now, that does seem to eliminate the possibility of carrying beer inside, but keep in mind: this is just a prototype. Presumably he's trying to solve that problem.
Once he resolves that issue, he might want to take some inspiration from the Transformers that could combine into a single giant entity, like the Constructicons, and make a series of alcohol-delivering Transformers that can...well, I don't know, serve as a portable bar. I'm not sure what purpose it would serve, but it would automatically be awesome.
http://www.getrobo.com/getrobo/2011/06/beer-can-transformer-robot.html? via Geekologie