So apparently Lance Armstrong, who is in Ireland for a global cancer summit, Twittered this morning and invited Dublin to go for a bike ride with him in Phoenix Park this afternoon at 5:30 (Irish time).
More than a thousand people showed up on bikes to ride with him. Rush hour traffic was completely blocked, and the bike hire shop in the park was booked out of its 190 bikes within two hours of the Twitter announcement. (They then donated all their profits for the day to Livestrong.)
It's things like this that make me smile.