Funny Aneurysm Moment is when events, either external or within a series, turn a joke into something disturbing, upsetting, or at the very least really uncomfortable. Harsher in Hindsight is when a tragic and serious event was made only more so. This is the opposite. It's when a later event, such as a current event or something that happened in the series, contrives to make something funnier than it originally was. This is what your literature teacher would call "Life imitating Art". There's a decent list in this College Humor feature and another one in this Cracked.com feature.