Wintertime fun in Montreal for those who hate snow

Today there's a scavenger hunt in the Underground City. Alas, the list of items is not available to nonparticipants. I assume that it includes insanely specific descriptions of napkins and straws from the hundreds of subterranean fast-food places, but maybe you also get points for finding abandoned hats, gloves, and half-eaten bowls of poutine. There probably isn't a prize for finding a forgotten man (un homme oublie), but there's sure to be a few of those hanging out down there. Is anyone up for organizing a scavenger hunt in Boston's tiny version of an enclosed city (i.e., Copley Place and the Prudential Mall)? I'd love to see people encouraged to steal those damn TV monitors who sole purpose seems to be plugging bad shows on CBS.