Originally Posted by greymule

"verbal obstruction"

Example:

Abel on 1B. Baker gets a hit to right. As Abel approaches 3B, F5 yells, "There's a snake under third base!" Baker reverses direction and returns to 2B.

I can't say I've ever seen VO called, though.

(N.B.: There is disagreement among clinicians over whether F5's comment would qualify as VO if there actually was a snake under third base.)