Your choices for Most Likely to Cause My Brain Synapses to Cease Altogether During an MLB Broadcast:
Joe Morgan, the Moneyball Mangling, Mustacheod Marauder
Eric Karros (remember, he was a Dodger)
Bobby "Lost in my own metaphor" Valentine
Tim "I can only speak in superlatives" McCarver
These are who I could come up with quickly -- guys that actually could easily improve the quality of the games they broadcast by simply not saying anything whatsoever for the entire game.
The only thing worse than how much they offend the general public by speaking so insipidly on a topic they should have broad knowledge of, is that they are paid a wage the vast majority of us would run naked through a swarm of bees while covered in honey to have.