– When someone makes a point yell “Goooooal!”
– Pull out a 2 foot long sub sandwich and start eating it, offer it to others.
– When umpire asks for silence, yell “Don’t tell me what to do!”
– When serve is about to be made and all is quiet, yell “Moooo!”
– Bring your own racket, ask when it’s your turn to play.
– Laugh loudly and yell “Someone colored the ball yellow!”
– Grunt loudly every time a player grunts.
– Tell everyone around you that you’re just here for the food.
– Fall asleep halfway through the game. Awake and yell “How did I get here?” , “Who are you?” , “Where am I?!?”
– Regularly talk to yourself. Argue with yourself about whether a ball was in or out.
– Introduce yourself to the person sitting next to you, tell them you are an excessive tennis fan and have been to many games. Introduce yourself again 2 minutes later and say this is your first tennis match.
– Bring a plastic sword, swing it violently in the air.
etc