That in itself almost set the tone for the next 130 minutes, for Berger is nothing more than a sex-obsessed layabout high on pot with 'a thing' about Sheila while his bisexual mate Woof (Bradley Judge) has more than a crush on The Rolling Stones' frontman Mick Jagger!
The tribe live a Bohemian existence in New York's East Village but when an Army call-up comes for Claude (Paul Wilkins), his pacifist nature over-rules his patriotic feelings and he makes several attempts to burn his draft papers, encouraged by his friends.
It's a show featuring plenty of enthusiastic non-stop singing and bare-foot dancing from what is clearly a talented cast although for me, the stand-out character was the cross-dressing show-stealer Margaret Mead (played by Tom Bales). His My Conviction number was comedy itself, especially as 'she' goes into the audience and plants herself on one gentleman's lap while calling his partner 'a bitch'.
With rallies and protest about the war, following President Lyndon B Johnson’s intervention in Vietnam, there's bisexuality, interracial relationships and the aforementioned nudity against the backdrop of a truly psychedelic stage set.
In the end, Claude – having had an out-of-body pill-popping experience – puts patriotism over his hippie convictions and suddenly appears in an Army uniform with a short back and sides haircut and puts an end to his former life.
I liked Hud (played by Spin on the night as X Factor's Marcus Collins was unavailable) along with Jeanie (Alison Arnopp) and Sheila (who sang Good Morning Starshine superbly) while there are certainly some outstanding voices, even though only a few of the songs were particularly memorable.
With the actors sometimes making incursions from the stage and into the auditorium, it was during the finale that the audience were encouraged by the whole cast to go up and join them for an exuberant reprise of Let the Sunshine In.
While Hair is not just a show about hippies with long locks, in reality it was the actions of those protesters that grew to such and extent following years of bloodshed, that the Americans finally pulled out of Vietnam having lost more than 60,000 young men themselves.
Hair is principally a collection of around 40-plus Galt MacDermot-penned rock numbers (many being reprised) marking out a truly dreadful moment in world history. Vietnam may have recovered over the past 50 years although for me, this particular show, courtesy of co-writers Gerome Ragni and James Rado, would probably have been far better left in the past!
Hair, The Musical plays Milton Keynes Theatre until this Saturday (20 July) with tickets from £13 from the Box Office, 0844 871 7652 or www.atgtickets.com/MiltonKeynes