This requires hats and cigarettes for Games Master and all players - plastic cutlery is fine if no-one smokes.
The Games Master starts slowly, and everyone must imitate his actions - for example, he stands up with his hat on, puts the cigarette in his mouth, sits down, crosses his legs, uncrosses his legs, takes the hat off, the cigarette out - any combination, and all players must imitate him. When he shouts 'Stop!' anyone not mimicing him exactly is out.
Next round, he does it all faster, then faster still, and then ...
he tells everyone that when he shouts 'Stop!' all the players must be doing the OPPOSITE of what he is doing - if his hat is on, theirs must be off, if he is standing they must be sitting, if his cigarette is out, theirs must be in, and so on.
The faster you do it, the better fun it is. A small child can always be the 'spotter', or shout 'Stop!' so everyone is involved.