Or maybe you're depressed and your brain says a shower is a Reward for going on a walk, but you're not motivated to go on a walk, so you don't deserve to waste water on yourself by taking a shower when you're just going to get dirty again, and now it's been three weeks and you feel like you need to punish yourself harder for being such a failure and not just going for the goddamn walk.

Then you finally get off the couch and go for the walk, but it's not Good Enough for your brain, and now I'm all sweaty and slimy and I still feel like I need to be punished for not just going for a walk earlier, so I absolutely don't deserve anything nice like a shower.