As a theatregoer, there is nothing worse than having a feeling that you are watching something above your intelligence level, a feeling that the words are getting beyond you either at such a pace or for myself with Shakespeare, they are not making a lot of sense. Act one of David Mamet's Glengarry Glen Ross was one of those moments, as the writer and performers deliver fast-paced dialogue, which while clearly more understandable than the great bard of old, leaves very little breathing room for taking it all in. Zone out for one second, like a dog spotting a squirrel and you are back on a hiding to nothing for a few moments trying to catch the thread again. However, this is all relative, isn't it? One person's attention span or intelligence level is different to everyone else, hence my unworthiness has to allow for the fact that this award-winning play, Pulitzer prize no less, has had remarkable success since its world premiere in 1983 at the National Theatre. The s...