One time he did it and I'm glad that I was able to catch it with my cellphone video. So, here it is. Have fun! :-)
Mommy: Okay, pretend that you're sleeping. Stop picking your nose!
Abi: (snoring like Spongebob)
Mommy: Abi, wake up! Abi, wake up!
Mommy: ah, you're asleep? okay.. Abi, wake up! Abi, wake up!
Abi: huh?! (acting surprise)