He threw his toys out of the pram when he lost the game.
throw one's toys out of the pram
idiomTo lose one's temper; to throw a tantrum.
The manager threw his toys out of the pram after the team missed the deadline, shouting at everyone in the office.
Rather than discussing the contract changes calmly, the director threw his toys out of the pram and stormed out of the boardroom, leaving the stakeholders in stunned silence.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.