-How does the irony in "Lamb to the Slaughter" by Roald Dalh make the story memorable?

In "Lamb to the Slaughter," Roald Dahl uses irony to make the story realistic. For example Mary encourages the officers to eat the murder weapon, "Why don't you eat up that lamb that's in the oven? It'll be cooked just right by now" (pg. 324). This shows that this is dramatic irony because the readers know that the officers are eating the murder weapon but the officers do not. This also shows that the readers have more knowledge than the detectives and making the readers believe that the detectives aren't good at their job. In addition, "Patrick's decided he's tired and doesn't want to eat out tonight. We usually eat out on Thursday's, you know, and know he's caught me without vegetables in the house" (pg. 320). This shows that this is an example of verbal irony because Mary Maloney speaks as if Patrick is still alive, but she knows he is dead. This also shows that Mary Maloney is a memorable character because her personality makes her seem extrememly sweet, when relly she is crazy to have just killed her husband. In conclusion, normal actions and behavior can be very decieving when needed to be, Mary Moloney for example was the perfect wife and was always cheeful and upbeat but when her husband explains some things to her and tries to leave she becomes someone that no one expected her to be.