right.js

var server = stack()

server.get("troll", function () {
    func()
    troll()
})
server.get("normal", normal)

wrong.js

var server = stack()

server.use(function trolling(req) {
    if (req.url === "troll") {
        func()
    }
})

server.get("troll", troll)
server.get("normal", normal)