Yes, I have actually tried these, unlike those people who obviously just got theirs from a chain letter or something.

1. When someones looking at the shelf, and away from their kart, walk past and unsuspiciously throw laxettes into their kart. (sometimes, they will notice, and inform you that you have "dropped" your laxatives)

2. Throw laxatives over the shelves into the next aisle. Get someone to stand at the end of that aisle, and use code words to tell you when someone is in the right position to hit them.

3. Have kart races (make sure you don't crash into the shelves and knock everything over)

4. Walk up to a complete stranger, put your face as close to theirs as possible, and scream as loud as you can, then run away.

5. Fill karts with stuff you dont actually want, but pretend to be all into it, then just abandon the karts in the aisles.

6. Shove laxatives into everything you can (like those boxes of coke, with the gap in them), or even a pair of sox, and some unsuspecting pensioner will get a surprise

7. Try to find something that costs 69 cents, and start laughing uncontrollably when the checkout dude says "69".

8. Hide around the corner, and when someone walks past, jump out and scare them

9. Sit on the side of the road, and wave excitedly to strange old people, they will excitedly wave back

10. In the car park, duck down really low in the car, with the windows open just a tiny bit (so the sound goes out) And scream as loudly as you can No one will know where the sound came from, and it will confuse the grannys

Okay, well enjoy You might not wanna do stuff at the same store too often, or the manager will recognise you, and chase after you (its actually a lot scarier than it sounds)