To have a one night stand with a girl on April Fools Day who tells you she's 18. When you wake up the next day, she says, "I'm only 17, April Fools!" You are then convicted of Statutory Rape.
Males and females that instantly don shorts and/or flip flops as soon as it's April 1st, regardless of the temperature. These people will then complain for the entire day about how cold it is and demand that April be warmer.
Most often spotted at the mall.
The first of April every year. According to Lisa Simpson, this is when the Christians changed thier calender to January, and the pagans kept it at the first of April. The people who did not change were called april fools, and thier day was sabotaged by Christians for fun.