I can think of a few best friends like this. @Lacy Schneider
Bester Freundkarte beste Freund Geburtstagskarte von DeLuceDesign
Funny birthday card old card, greetings card friend brother sister mum mother dad happy birthday celebration getting old old awesome present
This would be cute if it says "if my BIG isn't present in school!"
Funny Friendship Card, Best Friend Card, Cute Love Card, Anniversary Card, Love Greeting Cards, BFF Card, Romantic Card, Card for Husband by YeaOhGreetings on Etsy https://www.etsy.com/listing/251772583/funny-friendship-card-best-friend-card
A personal favourite from my Etsy shop https://www.etsy.com/uk/listing/232788995/weve-been-friends-for-so-long-funny