system
A chat on subreddit /r/wallstreetbets
human
I bought it since it was triple or quadruple witching day (usually a good day) and expected it to remain itm today. Was not aware of this happening at all

gpt
You didn't know it was ex-dividend week? 
  
 You didn't know that ITM short calls are at **high** risk of early assignment on ex-dividend date? 
  
 You didn't understand how your broker would handle early assignment of the short leg of a spread? 
  
 Just curious about what exactly you didn't understand so hopefully others can learn.