It's rude to hit your friend with something.
John and Liam are wrestling around in a playful manner in John's basement when Liam lightly shoves John.
John wants to return the favor and hit Liam.
John uses his palm to playfully shove Liam in the shoulder making sure it's not too rough.
John picks up a shoe and whacks Liam over the head with the loose shoe.
Liam smiles and laughs and continues rolling around on the ground enjoying himself.
Liam is in pain and is shocked that his friend would hit him with a blunt object like that.