I think the axiom on which this question is presented is also based on the movies. Namely this fellow from Heaven Can Wait.
God, in His mighty majestic omniscience hardly needs the prince of lies, darkness and evil to cough up a laundry list of sins. At the end of all things, the final judgement (as opposed to particular judgement) all your works will just be exposed.
The judgment will embrace all works, good or bad, forgiven as well as unforgiven sins, every idle word (Matthew 12:36), every secret thought (1 Corinthians 4:5). With the exception of Peter Lombard, theologians teach that even the secret sins of the just will be made manifest, in order that judgment may be made complete and that the justice and mercy of God may be glorified. This will not pain or embarrass the saints, but add to their glory, just as the repentance of St. Peter and St. Mary Magdalen is to these saints a source of joy and honour. Catholic Encyclopedia
And this is what Catholic Encylopedia says concerning Satan appearance at the particular judgement.
the appearance of angels and demons to bear witness before the judgment seat are regarded as allegorical descriptions (St. Augustine, City of God XX.14). The common opinion is that the particular judgment will occur at the place of death particular judgement
However, the question of whether Satan laughs is an alright one. Chesterton says that God's hidden virtue is His mirth. I'd imagine that Satan's most egregious vice is his wicked chortle. But, I hardly suspect, if he's read the Bible, that he's laughing on the inside.