Riddler: Riddle me this, are you scared of the big black?
Person: Big black what?
Riddler: ...
Person: I'm scared of what you mean because you won't tell me what you mean.
Riddler: Riddle me this, are you scared of the big black?
Person: Big black what?
Riddler: ...
Person: I'm scared of what you mean because you won't tell me what you mean.
Alright listen up, smarty pants. The Riddler is trying to scare the person by bringing up the 'big black,' but he chickens out before saying what it is. The person gets freaked out because they don't know what to be afraid of! It's like when you think someone's behind you, but it's just your shadow. You're scared of nothing, just like doom enternel's brain!