But it has been proven that opposite day can be also used for actions.
Example: Instead of slapping someone else, you slap yourself!
There are some problems with opposite day. You could just slap yourself, or you could totally over think it and go, hmm... Lets see, what is the opposite of: Slap. Hhh.. hug... Em.. Embrace! So I must have to embrace myself.. but... its opposite day.. so I should... slap my friends hug? Wait.. No.. his.. brothers aunt!
To avoid confusion while playing the opposite game, it is advised that you don't think about it too much. You should it simple and go with your gut reaction.
It can also sometimes be fun to imagine opposites. Example:
instead of pulling the pin,
And throwing the grenade...
You could pull the grenade,
And throw the pin!
You could imagine the rest.
Try out opposite day yourself! (don't do anything dangerous.. obviously.)
But wait! Before you go:
The sentence "Today is opposite day" is in fact a paradox. Don't think about it too much or it may create a black whole in your mind. Destroying it.