Best Things to Do with "open"
When someone knocks on your door open the door and act like they are not there and look around for someone and then close the door.
Cut open glow sticks and dump them into bubble solution to make glow in the dark bubbles.
If someone is watching you right now, open a new tab and type in "How to kill the person behind me".
Have a friend sleep over. Wake up before your friend, put your face really close to theirs, open your eyes really widely, until they wake up.
Go in a elevator and wait for the door to open and when it Does yell and make a scary face.
Hide in a cabinet in Ikea, and slam the doors closed every time someone tries to open it.
Have your own things to do with "open" to add? Send one in!