system
Given the following post, respond as if you're commenting on Reddit:
human
gift for professor as a postdoc

I will be leaving my PI's lab after 6 years. Going to an industry job which he had referred me to. Want to show my appreciation. We are not super close on a personal level but definitely chat on a regular basis and joke around. 

Budget wise I would say up to $500. A nice pen feels a bit cliche. But honestly don't know what else to get. Want to go for something unique and personal. Bobblehead? Feels like could be a miss.

Thoughts welcome!
gpt
To me $500 is way too much. I'd think a bottle of wine or liquor if they drink, a gift certificate to a restaurant, a good book, etc., would be appropriate. Most meaningful may be your handwritten words in a card.