At the Bear's parish, people sometimes clap during the announcements at the end of Mass. The Bear must silently pretend to clap lest he blow his cover and people discover he is a Bear. (You'd think it would be obvious, but it's always the little things that give you away.)
And, by the way, how do they handle announcements at Latin Masses? I've always thought it was awkward for the priest to read a long list of announcements, or even to have a parishioner to come up and give a brief talk on some upcoming program, before the dismissal.