So what to do to pass the time? Here is what I see people do on a regular basis.
The Talkers: These guys couldn't care about the amen the just missed, all they care about is complaining how long the davening is and why cant the chazan go faster. If they are into sports than all you'll hear is how they're fantasy team is down the drain, and how this guy cant play that sport. the Rabbi and gabbi will shush them, but it doesn't matter they keep on going.
The Readers: They keep to themselves through reading, be it a gemara or any old english book. You'll never have the Rabbi shooting looks at them.
The Pacers: They have nothing to do besides take a walk around the shul. They are usually the ones to clop for yaleh vi'yavo at the beginning of shmona esrei. They never have a siddur in their hands while walking, so when it come to kedusha you can hear them say the first few words loud and then they quiet down because they don't know the rest. Many times these guys walk up to the chazan and tell them random facts about shemona esrei, while they are in middle of chazaras hashatz.
The Collector: this guy goes to each and every guy, and some twice, just to get all their spare change for tzedakah.
The Astronauts: They just stare into space, thinking about Gd knows what, till the chazan finishes, at the end they cant remember if they stood for kedusha.
The long Daveners: These are the people who daven through the whole chazaras hashatz. Some of them stand still while davening and don't move unless the need to bow. Some are really violent and twirl they're peyos as they shake, or they just leave the peyos out, and messy. Then there are others that actually look like they are having a conversation with Gd.
The Listeners: Yes these people actually are listening to the chazan (hard to believe). Some of these people actually put their fingers on the place, and say amen with a lot of concentration.
The money counters: Plain and simple they count their money. These people get nagged by the collectors.
The textors: Even though cell phones must be turned off as you go into shul, some still text. these are the guys whose cell phones goes off during shemona esrei.
The Coffee Drinker: These guys are out of the shul during the repetition of Shemona esrei getting their coffees, and missing everything, only to come back when its over.
Mike In Midwood: Goes to shul to daven and get out. I just like doing my thing and then leave, that means; I don't talk in shul, or have a long shemona esrei, don't drink, I read a little, I day dream, give tzedakah, then I leave (of course I stay for aleinu).
What do you do during Chazaras Hashatz?