I stumbled across a stash of porn in a CEO's laptop about 15 years ago during a routine virus scan.
I pointed out that malware was found in said folder and he told me to keep quiet about it. Offered me a not insignificant amount of cash to keep schtum and omit the findings from my ticket log. I refused the cash because it wasn't routine to include the paths to the virus / malware in our logs at the time (for privacy reasons).
I wouldn't mind, but it was gay hardcore porn and he was a married man with kids. It also transpired that he was having a gay fling with his business partner.