You can say:
– Just joking!
– Don’t take it seriously!
– Just teasing you!
– I’m just pulling your leg.
– I’m only being silly.
– I’m just poking fun at you.
– I’m just fooling around.
– Just trying to take the Mickey.
– I’m just messing with you.
– It was only a joke.
– I’m just having a laugh.
– I was only playing around.
– I was only jesting.
