First thrash I ever heard was on a cold winters day. We were surfing South Stradbroke island at around age 15, overcast sky, sea was dark, surf was huge and the wind was an icy westerly.
Up until then I'd only ever really listened to Top 40 and the heaviest music i had was Bon Jovi or The Cult. Growing up in a very religious house I was scared of kids in metal t-shirts and thought listen to it would give me a head-ache .
Mate of mine had 'Ride The Lightening' on his walk-man. Told him I wouldn't like it but he said' just give it a go'
I always remember sitting there looking out over the violent brooding ocean, and 'For Whom the Bell Tolls' started ..
Dinnen Dinnen durnnn.. do do do do, do do do do.... Dinnen Dinnen durnnn..!!!.
6 months later and my mates would play me 2 seconds of any Metallica song, on our trusty walkmans, and I could guess it straight away.
From there I went to listen to a lot of Slayer, Death Angel and Sepultura. Was never really a Megadeth fan , not for any main reason, just preferred the others.