How Hamlet Differs

Besides Hamlet, the other Shakespeare plays that I have read include: Twelfth Night and The Merchant of Venice. One particular aspect of Hamlet which differs from the other plays that I have read is that Hamlet at least from what I have seen,  appears to be a straight tragedy. This is in direct opposition to Twelfth Night which was an obvious comedy, and The Merchant of Venice, which I would classify as a tragicomedy. However, although Hamlet is tragic in nature, it still appears that Shakespeare incorporated comedic aspects into the play. For instance, in Act 1 Scene 5 when Hamlet meets the ghost of his father. After Hamlet the elder disappears and Hamlet junior is talking with Horatio and Marcellus, Hamlet the elder's ghost can be heard wailing "swear". For some reason, I found the shrieking of the Ghost to be rather amusing. I am not sure if this was intended by Shakespeare or if I just have a sick sense of humor. However, if it was intentional, then it reinforces the idea that even in the darkest of tragedies, a little amount of comedic relief is necessary to keep the audience entertained and engaged.