Try to get people to think you and your best friend are sisters/brothers.

Empty out a bleach bottle and refill it with milk. Carry it around and drink from it . For best effect, bring a cup along too.

Put on socks, spray the floor with Pledge, and slide around (works best with hardwood floor).

Sit in your best friends lawn dressed as a doll/creepy thing, stay there until someone sees you, and grab their leg.

Mess with the best buy computers.

Text your best friend if the want to come over for a fish slapping party (see there responses) have a can of sardines (see the reaction)XD XD XD.

Randomly text your best friend and say you need to ask them something super important, but make a long paragraph. When they say what is it, ask if they know where the gingerbread man is

Make a packet of jello and pertend its your best friend.

Ask someone were the best place to hide a body would be.

Listen to the song "Take A Hint" until you can memorize it then go preform it with your best friend in the middle of any public area (such as a mall, park, etc.).

Have a better idea for this list? Send it on in!