Raj's Rule by Lana Button

Raj has one rule: he never uses the bathroom at school. It’s just not the same as the one at home. All day, he avoids bathroom trips. Easy enough, since he lives by these tips: Don’t linger at the sink. Stay away from anyone who makes you laugh. Watch out for distractions, especially schoolwork. And sit still: no running, jumping, cartwheels, or sneezing. Until one day―achoo!―Raj has to break his own rule.