Ha! Love the 'shock and awe' thing, both as an approach to toddler wrangling and as a phrase 
The only problem you have now is that DS might have had far too much fun and be diving into the bath fully clothed tomorrow night
As for the other parent in this... your dh needs to get a grip, it's not the same as you grabbing your dh and manhandling him into water... it's really not. It's not the toddler equivalent of water boarding either.
Good thing for them to remember: Toddlers are not mini adults.
They get traumatised by some things a grown adult wouldn't think twice about, and vice versa. I.e. Toddlers need far more physical affection and touch than a grown up. Toddlers can't parent themselves, and need their parents to be strong and loving and in the driving seat when it matters.
Or on a less serious note, they have utter melt downs about the cause & effect of their world. It looks like their worlds are collapsing, and the trauma will stay for a lifetime...
Especially physics. Toddlers hate physics.
Loathe it. Rail against it. Are broken by it... and it's our job to show them it's ok really and it's nothing to be scared off (unless you're studying it at a-level. Then it's ruddy scary and certain people may have dropped it as I someone was clearly going to fail it miserably. Ahem, I digress).
So we comfort them through the utter horror of learning that biscuits stop being whole when you eat them. And cutted up pear can't be made whole again. And my sons worst tantrum ever, which was the utter cruelty of not being able to rewind time to choose an ice lolly not a sweetie. Hideous racking sobs of 'I want to go back, back, baaaaaaack...'
He's rather older now and has accepted the limits of the space-time continuum... mainly.