I love the creative thinking that went into this "mugging" outreach idea. I've known of numerous variations on similar servant evangelism / acts of kindness outreach efforts. My "two cents worth" is that one of the most important factors to any activity like this is to know your context. In one neighborhood, it might be highly effective if conducted just as Jason tells in the original post ... but, in another part of the country / or community, there may need to be adjustments. I know of one Texas church that did a "mugging" as a follow up gift after an evangelistic block party.
In my SE Michigan neighborhood (82% on government support), we have cleared neighbor's sidewalks and driveways with our snow blower and that has made an impact ... or we have collected food for the hungry through our church for a local food bank. Both opened doors and made an impact. When helping Ted Baird in Anthem, AZ to do some of his first outreach activities and a block party for the church start, we swept pebble rock off of driveways and made a memorable impression on community residents. Why?
Because in both instances we considered the context, and that made the difference.
bobby gilstrap