The only thing I hate more then white university students playing the didgeridoo is mimes.  I hope some cop pulls these guys over and gives them a ticket for riding without helmets.  If they tried to complain the cop could pretend to see the motorbike that they are pretending to be riding and pretend it doesn’t have a current registration or warrant of fitness either. If they kept complaining the cop should remind them that the best thing about mimes is the not talking part.