本当ですか is polite surprise. マジで／マジか is what friends actually say, and comedians say it to the audience.
Friends and coworkers you joke with. Not in an interview.
A grandchild finds out that Grandpa has been taking an exam too.
For real?
Textbook本当ですか。Slang "マジ" replaces "本当"; bare "マジ?" with rising tone does the asking, no "で" or "ですか" needed.
In a talk about whether adults really need friends, someone asks about the people who think friends are necessary.
Being away from your hometown friends is seriously, like... you know.
Textbook地元の友達と離れるのは、本当に大変なことですよ。「マジ」 is slang for 「本当に」 ('seriously'), used here as an intensifier; 「あれだよ」 vaguely stands in for 'hard', textbook 「大変です」.
One friend has been explaining how special a certain ball is.
Seriously?
Textbook本当ですか？Slang 'マジ' ('serious') plus 'で' replaces '本当ですか': 'マジで？' = 'For real?'
The comedian recalls having something extremely brown and wanting to show it to the other kids.
Culture note Bikkuri Donkey is a Japanese family restaurant chain known for hamburger steaks.
I was like, 'Seriously, take a look at this.'
Textbook「本当に、これを見てみなさい」と言いました。'マジで' is slang for '本当に' (really/seriously); here it intensifies the blunt command '見てみろ' (textbook '見てみなさい').
Someone questions a street performer who moves only a little when money is put in, trying to learn where a culprit fled.
This is seriously important info.
Textbookこれは本当に大切な情報ですから。'マジで' is slang for '本当に' ('seriously'), used here as an adverb before '大事'; plain 'だから' replaces 'ですから'.
From other routines in the library. Automatic transcripts, not yet checked line by line.
マジで？ means “for real?”. 本当ですか is polite surprise. マジで／マジか is what friends actually say, and comedians say it to the audience.
With friends: OK. With coworkers: careful. With a boss or teacher: avoid. Friends and coworkers you joke with. Not in an interview.
In 1,905 live comedy routines, マジで？ appears in 912 lines from 173 comedians.