Just ignore me if you were joking, but do I have a serious question about exactly this. I've considered doing something like this for myself. Not an app, but I thought I might wrap my credit card in a bit of cardboard that says "Wait! Think! What are you doing?" as a speed bump against my compulsive spending.

Does this actually work for you? Do you open the app and it says "Don't drink, fuckface." and you're like "oh, right, OK. I won't." Or do you just blow right past it? I used to work in a shop with gruesome safety posters on the wall at work but after a couple of weeks, I stopped noticing them. I figure this would turn out to be something like that.