I really enjoy IRN-BRU. The company also has great advertisements and this is one of my favorites. (If you live in the USA and want to get some authentic IRN-BRU), you know where to get it.
Note: There was an embedded video here (totally legal, right off the IRN BRU corporate web site), but, unbelievably it ran in a loop. So, it kept going again and again and again, so I took it down.