My DH is the king of "false budget" purchases. A couple examples:
a bike, his argument: I'll ride it to work, we'll save on gas, it'll be great exercise, etc. How long he used it? About a week. But my oldest son does ride it sometimes, so not all bad.
Online electrician school, his argument: I'll take these classes, then I can become an electrician when I get out of the Army. Reality? There's a reason the GI Bill didn't cover these "classes", probably not accredited, but it didn't matter, he did them for about a month before getting bored. Never finished, $3000 down the drain and I have refused to endorse any more "I want to go back to school" ideas from DH.
Pick-up truck, his argument: I can use it to haul stuff like if we buy furniture or something, camping gear, or the kids' bikes. Reality? Trucks are more expensive than cars so the cash we had didn't buy as nice of a truck as it would have an economy car. So he had a small (think s-10) sized truck that could only carry one child at a time and wasn't safe to drive any further than his commute. It started having problems that he didn't tell me about, I didn't know how bad they were until I needed to drive it 2 miles one day and stalled out on the road

. Bought for about $3000, sold for $800 and I think most of that was for the toolbox

.
I'll stop there. But I will say that I have had to become more assertive at putting my foot down with Dh. I grew up in a household where my Dad made all of the decisions so it's hard for me to not go along with what DH wants to do, but after a series of bad financial decisions I've had to start saying no and explaining my reasoning. I did talk to him about my concerns before these purchases, but it was hard to get past the mentality that he makes the money so he should spend it the way he wants (this is MY thinking, NOT anything he has ever suggested.) so in the end I let him do what he wanted. Not anymore.
In his defense, one of our best budget purchases that he also suggested was our crockpot, so not all bad.
