I once started bulking when I didn't mean to.  First time in my life that I had any weight.  I had been trying to up my protein and hadn't actually done the math on peanut butter.  I had been really dumping the pb on pb&js to increase it's protein.  Turns out if you really try you can fit 1000 calories onto a single pb&j. It actually has one of the worst protein to calorie ratios.  It's like a 10 when everything else you think of having protein is a 25.