I am terrible myself when I make a trip to Sam's Club alone. Hey, peanut butter, two big ass jars for $10! What a deal! Now, let me get this block of cheese for $15. Hey, there's an industrial sized box of chicken patties. $25, but it will last me until I'm 83!
The wife is not necessarily an "extreme" couponer, but she does use them a good bit. I am amazed sometimes when I go with her to Publix to see the subtotal before and after she gets her 20# binder of coupons out. Honestly, between the BOGO offers and additional coupons she gets from the Sunday paper and the little insert papers they send during the week, they almost pay us to take some of their crap.
***edit: Also, what the truck bed shitter said.