What "Challenge" should I do for 400 subs?

[Rouge]

Hey people, I am wondering what I should do for 400 subs. I use the term challenge lightly so it can be anything. thanks!

-R

 

[Dat Boi 1D]

how does the milk challenge sound?

 

[KGATV]

whip cream challenge

 

[ghostlyrich]

raw egg challange

 

[davion100]

Cinnamon ?