On the trail in the morning I sing my bird alert so they'll fly out of the way: "Good morning little birdlies, good morning to you, good morning little birdlies, good morning to yooooooou!" in my best loud operatic falsetto. Fortunately there aren't a lot of people on the trail at 6:30.
On the way home on the trail I like to slalom between the stripes; I tell myself I'm practicing my bike handling skills.