Woo, glad I am not alone then...
I don't drink and buy often but when I do, especially during sales like the steam sale going on currently sometimes I just flip a blind eye to the bank account and go to town.
However my purchases are typically low cost sale games, there has been a couple times I am sure where I have spent a good amount on something I just had to have at that moment.
In the end I am never driving obviously, but surfing on the computer or on the phone or showing my brothers cool stuff and stumble upon something ... etc.