Pretty self explanatory. What can't the HA above you fess up to Mum and Dad?

That they are actually really a great artists, his parents hoped he would go into fields of science and technology and if they found out about his true passion it would bring them to shame.

Fights secretly undercover for the enemy to help them gather intel and silence anyone who gets in the way.

pretends to be artsy fartsy and all theatrical so they don't realize that blue skin is permanent and a side effect of too many biochemical experiments from college. He dreads what happens since he and his wife are expecting and the baby may be light blue.

Doesn't want his parents to know he is actually a drug dealer (They already know though, but don't say anything)

is planning to run away from home due to an arranged marriage

you've told them these tattoos are temporary turns out they're not

That they're secretly the right hand man to a bond-esc villain.

Evil offers dental how could they refuse!

Practicing witchcraft and sorcery in your room.

is secretly dating an oak tree. She's allergic to acorns but knows how much it'll piss them off when they find out and they're really only reactive when they're really ripe at which point she befriends an army of squirrels. It's the squirrel thing which is what will make them mad if she only knew.

does not eat his bugs like he's supposed to, because he is secretly a vegetarian. He hides the bugs in his closet and they all transform into beautiful butterflies. Though everyone knows that butterflies are just bugs in disguise...

Is afraid to get a real facial tattoo and paints it on every morning

This is a lie, Mr."I-Hide-My-Twilight-Fan-Tattoo-Under-My-Hoodie"! Confess, you have a tattoo on you back, saying "Edward Forever".

Please don't hide the coprses you've buried in the backyard from your parents. They'll end up paying for it, too!

is hiding the fact that she's part ghost

Youre secretly a drug dealer. Those arent jelly beans, but your parents dont know that...

you're a werewolf stripper but you'd never tell your folks

you and your parents are dead. You know that, but you think to yourself, who cares? We got all these jellybeans anyway.

your shark family don't know you are vegan

That they are a blood thirsty killing machine!!