You can tell the person on the other end of the line that you are in your office, or in your living room, or in your kitchen, and they'd believe you because they can't tell. However, within the first two seconds, they'd know if you were taking a crap in the toilet. Yes, actually taking a crap. Because any other situation, whether we are washing are our hands, or on the way out, we'd rather wait until we get out of the toilet before we answer the phone. Must be the reverb.