f(x) member Amber is up with another hilarious idea for her fans. On her twitter account, she conducts a 'scavenger hunt' for "#snoopyandstitch" derp faces. Fans tweeted her with a photo of her and Henry's derp faces.

She tweeted, "Lets find the best derp face of me and @henrylau89 teehee #snoopy&stitch #143"

See the photos she chose below:








After that, she tweeted, "Thanks u guys for doin this scavenger hunt w/ us! We had tons of fun! Dont forget to listen to "1-4-3" by @henrylau89 feat me! Love u guys!".

Which one is the best derp photo for you? :)