i'm not 100% sure this counts as a mixed metaphor

but i am 100% sure it counts as stupid. bob griese, calling the penn st.-michigan game on abc, talking about how michigan needs to establish a ground attack because they don't want to put too much pressure on their freshman quarterback:

"Once they get that running game going, anything else is just the cherry on top of the iceberg."

you sure it's not gravy at the end of the tunnel?