It's that time of year again when we show up and cheer and hell and give out free high fives to our friends (and random strangers) who are running the Boston Marathon. Come for a while, stay all day, whatever works for you! We watch from a little beyond the 24 mile (39 km) markers. If you want to see the pros scream past you probably need to be there by 11:30. Those on wheels will be by even earlier.