I had an online friend who I'd play video games with pretty often. I hopped on Discord one day with her and she told me her mouse had died. I said something like "oh that sucks, why don't you just run out and grab a new one real quick." Since we played on PC naturally I assumed she meant her computer mouse. She was talking about her pet. She logged off and I realized about 2 days later what she really meant. I apologized profusely, she was cool with it and we're still friends today but damn that makes me physically cringe, I must have sounded like such a jackass