Anchorman 2
Plot-wise it kind of lurched all over the place with several endings and new beginnings as opposed to a clearer beginning-middle-end, but in terms of painful belly laughs, probably superior to the first film. One of the final set-piece scenes has an absolutely astounding number of cameos, which I won't spoil for you here.
Let's just from a wrestling fans point of view, I hadn't seen that much star power in one place since the 1992 Royal Rumble.