YOU SAID:

I went to a party and the funniest thing happened

INTO JAPANESE

パーティーに行ったら、とても面白いことが起こりました

BACK INTO ENGLISH

I went to a party and something very funny happened.

INTO JAPANESE

パーティーに行ったのですが、とても面白いことが起こりました。

BACK INTO ENGLISH

I went to a party and something very funny happened.