What about the intelligent design of goose bumps? I’m perfectly happy to consider them a quirk that results from evolution working in tandem with design. But let’s say we had to come up with a design explanation of them. Here goes: goose bumps kick in when we’re frightened or cold or otherwise experience strong emotions. But is it that we are consciously having such experiences or is it the goose bumps that assist in bringing to consciousness such experiences. Goose bumps are, after all, not under conscious control — they are governed by the sympathetic nervous system. Perhaps goose bumps are designed as a way of bringing to consciousness various stresses that need attention.
Thank the Intelligent Designer for goosebumps, then! Without them, we’d never know that we were cold or frightened. I suppose stomach growlings are also intelligently designed, because otherwise, how would we know that we’re hungry?
But seriously, Bill: if you’re going to pretend that ID is scientific, then tell us how this just-so story of yours can be tested. What experiment would you perform, what data would you collect, to see whether it’s true? Just as importantly, what results would (potentially) convince you that this explanation is wrong?