Cubs Classic Moment - Padres score run on 'fielder's indifference'

I know all teams have moments where the mental and/or physical aspects of the game don't synch up exactly right and you get a play that is memorable for all the wrong reasons. It just seems like the Cubs have them happen more often than most of the other teams. I refer to these plays as Cubs Classic Moments. One of these plays went down in today's game.

The play that happened today was actually a fairly innocuous play that probably didn't affect the outcome of the game. It is a play that may not have even made its way into my consciousness if it weren't for the internet. You see, given that I have to work for a living, I follow most Cubs day games via live feeds on a variety of internet sites. These live feeds update throughout the game with a text play by play of the game that uses a fairly standard boiler plate language. Every now and then, a play pops up where the standard language doesn't quite explain what happened. I usually make a special point to try to catch a highlight as soon as I can in situations like this so that I can figure out what the heck happened.

This is what Yahoo Sports posted for the play I am referring to from this afternoon;

- C. Denorfia grounded into fielder's choice, C. Headley out at home, W. Venable to third, W. Venable scored on fielder's indifference

Say what? How does one score on fielder's indifference? Isn't that only when a player advances a base because the defense doesn't care? This usually occurs in a blowout situation where a player advancing a base doesn't matter. How could the Cubs possibly not care if the player advancing a base was scoring a run? I finally caught the highlight of this play a little while ago. The play started with runners on 2nd and 3rd. There was a ground ball to Aramis Ramirez at 3rd, who threw home to Koyie Hill which stranded the runner in between 3rd and home. Hill ran the runner back toward 3rd, which was now occupied by the runner who started at 2nd. After tagging the runner out at 3rd, Hill apparently tried to call timeout (the replay doesn't show Hill making much of a gesture) and then he turned and walked to the mound to talk to the pitcher Justin Berg. The ump never granted timeout and the runner now on 3rd base took off for the unoccupied home plate and scored. A true Cubs Classic Moment!

What is it that makes the Cubs so susceptible to weird gaffes like this?