okay you know that all of us moms have used that expression before.....either it is us doing the screaming or the kids! Yesterday I was down at my parents house and I don't remember what I was talking about, but my seven year old heard me use the expression and looked me dead on and says who is screaming blood (such a literal child). I explained that it was just an expression and it is used when you want to get the point across that someone was really upset or screaming really loud. She looks at me again...but where is the blood. At this point my parents and myself start cracking up and my mom starts in on the explanation....to no avail. finally i give up and later on the car ride home...sydnie uses the expression in the right way....something must have gotten thru. Gotta love that...those little day things that might life so enjoyable.