absurd idea afebrile delirium automatic response blind impulse boutade brain wave brainchild bright idea bright thought brilliant idea capriccio caprice conceit crank craze crazy idea crotchet deliriousness delirium drive fad fancy fantastic notion fantasy flash fleeting impulse flimflam fool notion freak freakish inspiration good idea gut response harebrained idea humor impulse incoherence inspiration instinct involuntary impulse kink lingual delirium maggot megrim natural impulse notion passing fancy quick hunch quirk ranting raving reflex sudden thought toy urge vagary wandering whim whim-wham whimsy