From BBC News:
Humans should 'talk' like chimps
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If humans behaved more like their chimp relatives they might be better at communicating, say experts.
Scientists at the Zoological Society of London are looking for volunteers to "talk chimp" in their everyday work and home life to test out the theory.
One part of the survey recommends waving your arms, brandishing objects and making yourself appear large, to assert authority over others.
Volunteers can also bond with their group by grooming each other.
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http://news.bbc.co.uk/1/hi/uk/3607317.stm 
NB: Zoological Society of London is two minutes walk away from the US Ambassador's residence at Winfield House in Regent's Park. Maybe they should test their scientific theories on Shrub's principal Apeman-in-residence, William "Stamps" Farish III and his gargoyle wife Sarah....