Yeah, "On your left" doesn't often work for me on MUTs. Basically the way I see it, MUTs are only for bikes if you're going 3mph or less. Otherwise it's a hassle.
And those freakin' dog leashes that are a mile long, ugh. But then hey, I can use a road more easily than a ped can, so I guess they get the right of way.
I hate that little jig peds do when you announce you're passing! Ha it's funny. My dad jumps around all over the freakin' place if we're walking a trail together and it's ME that says a bike's coming. He's 63 or something and he's just jumping all over the place, you'd think I yelled, "Incoming!" or something, jeeze!