My idea of an April Fools joke is shouting "APRIL FOOLS!" and (lightly) punching my friends in the face

Me: APRIL FOOLS! *puts fist on Kat's cheek*

Kat: ...I could punch you so hard.

But we both know she wouldn't

Kat and I have one of those best friend relationships where Friend 1 (me) is derpy and insane and Friend 2 (Kat) is slightly less insane and Friend 2 acts like he/she could/would beat up Friend 1 but they both know he/she wouldn't because they're BFFs

Anyone else have those kinds of relationships with their best friend?