One year, when I was in high school, I played an April Fools joke on my mom and brother. I was generally the first one up in the morning (so I had dibs on the shower). Anyways, I was getting ready and pretended to look out the window. I yelled, "Oh my gosh, there is a DEER in our front lawn". My brother and mom came running over to the window to look, and I blurted out, "APRIL FOOLS".
I didn't want to do anything too mean or cruel...but it was more probable considering where we live.