Do nostalgic posts about your childhood in the 90s and early 2000s send you into a existential panic, but in a fun way? Well, then have I got the memes for you. TikTok videos exalting classroom Christmas parties from our childhoods are the most emotionally crushing of recent nostalgia posts. They feature a wistful rendition of “Have Yourself a Merry Little Christmas” in the background, featuring old images of kids watching the Poler Express, playing in the snow, and just generally celebrating t…