I don't mean to fling olives on the floor but...

A dramatic way of saying you're about to ruin the mood with the obvious

I don't mean to fling olives on the floor but your mom still lives in your pants.

I don't mean to fling olives on the floor but your brain is still in the 2010s.

I don't mean to fling olives on the floor but your life is still in the trash.