Yesterday, five year old No. 2 had what has become a right of passage in our family. He got his first Clipper Card with his San Francisco MUNI pass. When now seven year-old No. 1 got her Clipper card and could boop onto buses and trains, she instantly became the envy of her two younger sibs. 2 asked for a Clipper card non-stop, and it wasn’t long before 3 also got into the game. We compromised by getting 2 and 3 their backpack Clipper card holders early. 3 delights in holding her holder up when we get in the bus and saying, “Boop.” So, it was with great glee that 2 legitimately booped his way onto his first bus Thursday evening. We had a bit of a hiccup at the BART station heading out. (2 got stuck in the clamp-like jaws of the BART gate once when 2 year-old No. 3 went in front of him. Since then, he and 3 have gained access to BART stations through the emergency gates.) 2 booped his card on the BART gate well enou...