When, months later, the PM panics because the metrics are down/the customer support is receiving complaints, but they wouldn't be if they just acted on your insights:
WE WANT YOU TO DO USER RESEARCH WE THINK ITS SO IMPORTANT! SO WE CAN'T GIVE YOU A BUDGET, YOU CAN JUST DO GUERRILA RIGHT? THE TEAM HAS STARTED THE SPRINT ON MONDAY, WE REALLY NEED THE INSIGHTS BY THURSDAY. WE CAN'T AFFORD RECRUITMENT, YOU CAN JUST TALK TO THE CEOS FRIENDS &FAMILY