When gatsby tells nick that he is "trying to forget something very sad that had happened to me a long time ago," why does nick have to restrain his laughter?

Gatsby told Nick this so that Nick won't believe the "accusations" of him that has been going around. However, Nick restrains his laughter because he feels as if what Gatsby said was fake. 

Where is the painting?

Religion changed from primitive times through the renaissance period until today such that certain church conventions and rules were set about how the holy family could be portrayed. for instance: mary must always be in a blue mantle, jesus could only be in a white robe after the resurrection, jesus could no longer be seen pointing with his walking stick when performing a miracle, and so on.hope this