Knock Knock, Who's Thread?

白底黑字的英文谐音冷笑话文字图，内容为敲门对话：Knock knock / Who's there? / Race condition / Race condition who? / Ray，利用 race condition 与 Ray 的发音玩梗，适合表达无语、冷场、尴尬或嘲讽烂梗。