My favorite is when a character says "Shield generator/teleporter over there!" I'm like where, I have no idea where you are!
Or when the character I'm playing, says they found it... problem is, I don't see it!
Like I was playing Sombra, and I was on top of the building at the first point on Anubis (The one closer to the second point, not the one with the large health pack nearby).. and Sombra goes, I've found their shield generator.. I was looking around like crazy, trying to find it, just to see where it was.. I didn't see it, and then we lost the game because time was running out.. Now I'll never know where it was, because I just want to know! XD