We were riding last Saturday on a MUP. When we rounded a corner, there were 4 teenagers (2 male/2 female) walking side-by-side and taking up most of the path. The 2 males looked back at us and they proceeded to widen out a bit to take up the whole path. My dear wife slowed quickly. I, being 230 lbs. and on my '86 steel-framed MTB peddled harder and went off into the gravel on the side of the path. One of the males left the path to try and block me. I managed to keep control as my bar end contacted his elbow, hard. Hopefully they will learn to share the road next time.