Take some responsibility chaps. You can't complain about everyone around you not making any noise while you were also sitting there quietly. Just because you join in with a chant enthusiastically when someone else starts it doesn't make you any less guilty. I've been in the Zone for 90% of home games over the last few years and I don't often remember cases where people start up a chant and then no one picks up on it...in my experience if someone is loud enough then everyone else joins in quick smart.
It might be a case of too many sheep...so then what we need is a few people to take some responsibility and begin chants for the sheep to take up.
The only alternative is an Aussie/European style band leader with a megaphone/drums etc and I'd hate that crap to happen.
P.s Sunday night with most people heading back to their first day of work the next day = subdued atmosphere for sure