Get a cart and pack it full of Harry Potter stuff then, run into a wall and yell, "I must get to Hogwarts!"
Put something cheap (like gum or pencils) on layaway.
Eat the vegetables raw.
Slap the cashiers.
Throw skittles at people while yelling, "Taste the rainbow!"
Sneak through the isles humming the Mission Impossible theme song.
Get a fox stuffed animal and run around yelling, "Swiper, no swiping!"
Wipe chocolate on your hands in a bathroom stall, then go up to someone who is at a sink and ask, "Could you pass me a paper towel?"
Hide in the clothes rack and when someone picks something out yell, "That won't look good on you." Or, "That's not your size."
Get a cart full of stuff and drop it randomly around the store. When people try to give it back to you say, "Shhh, I'm leaving a trail."
Block the isles with carts.
Around Christmas time, go around and push the buttons to all of the singing Santas.
Get a fishing rod and randomly cast it at people.
If you're 13 or older, go up to a worker and hug them and say "My mom left me! She said I couldn't have the skittles!!! Wahl!!!
Start a soccer game, and get others to join in. Use the store as your field.
Pitch a tent in the camping section and when people walk by say, "Beware of the bears!"
Spray perfume/cologne on random people.
Set all the radios to a stupid station, turn it up really loud and quickly turn it off. Wait for someone to turn them on.
Open all of the freezer doors then run down the isle slamming them shut.
Go into the dressing rooms and 10 minutes later yell "Where is the toilet paper in here?"
When the intercom comes on, get down on your hands and knees and yell, "It's the voices again!"
Go up to a random stranger and ask, "Mommy, can I get these M&Ms?"
Tell someone who works at the store that there's a code 9 in electronics and see what happens.
Grab one of the balls from the bin and get a sibling to throw it to you. When you throw it back, hit some random person in the head and say, "What do you mean that was out? That was in."
Have a sword fight with the fishing poles.
Hop around the store on those sit-and-bounce things.
Tell an employee that you want to buy a fish then stick your hand in the tank and try to grab it and say "I can't wait to eat it!"
Get all of your friends to play the guitars and play and sing a song really bad.
Randomly switch carts with the person next to you and when they turn around call them a thief, slap them and run around a corner.
Set up a G.I Joe vs. Barbies war in the toys isles. Get people to bet on who will win.
Run around kissing random guys and when they look at you weird just say, "Sorry, wrong guy."
Open a package of paper in front of the manager; take one piece and when he tries to stop you say, "I have to write a letter!"
Ride around the store on one of the bikes. When asked what you are doing, tell them you were taking it for a test drive.
Bring a plastic ring and go up to random people and ask, "Will you marry me?" It's funnier to call them a name like Jerry or Jane.
When you see a couple holding hands, run through them and say, "Red Rover, Red Rover!"
Move a 'Caution Wet Floor' sign to a carpeted area.
Ask random (hair color here) if they are (celebrity name here)
If a clerk ask you if you need any help, get down on the floor and cry, "Why wont you people just leave me alone?!"
Whenever you see a couple looking at something, grab it out of their hands and say, "No not right." and walk away shaking your head.
Go into a bathroom with a cart and put it in a stall.
Get lots of bouncy balls and throw them down an aisle shouting, "Pikachu, I choose you!"
Take a blanket and cut eye holes and go up to random people and say, "I'm a ghost."
Grab a toy out of someone's cart and start turning the box asking, "How do you work this thing?"
Set all the alarm clocks to go off at the same time.
Pick up an intercom phone and yell, "We're out of crackers! Ahhh! Run away!"
Run around the store and grab random healthy things and yell, "Must have sugar!"
Run around to where the crowds are big and switch toys from some of the carts.
Act possessed by some crazy demon.
Grab red lipstick, run in the bathroom and on the mirror, draw the target sign and write "Target is better!"
Yell at the manager, "Why don't you have this in XXXXXXXXXXXS?!!"