The other day my wife, son and I were at the beach. Lucas, at 2.5 years, is generally very good about being courteous and careful with other people. Like any child his age however, he occasionally has lapses. On this occasion he winged a frisbee at my wife. After he did so I prompted him for the usual gosh-I-really-had-no-idea "Sorry." Me: "Lucas, what do you say when you almost hit someone with something?" Lucas: "Duck!"
(From the "Rest" of RHF)