I know some big name lifters powerlifters and bodybuilders both who take absolutely insane amounts of gear. Scot Mendelson the former world record Raw bench press holder at 715lbs I think it was gave another world class lifter cyce advice which was something alone lines of
3000mg a week of test
2000mg of deca
etc etc......so whats the craziest you've heard of?
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And here is his stack
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Well a lot of the guys taking super high crazy cycles are elite athletes. There is a VAST difference between competing at highest levels of sport and being a casual lifter like most people here are. But the health consequences of those high dosages can definitely be severe.
Also the eite guys are under close watch of doctors
What I find funny is not the cycle when they are on it, but when they say "oh Im not taking anything now" and yet not taking anything means just 5 ius HGH 750 mg test and 50 mg anavar LOLOLOL yeah not taking anything 
Lol for them that is nothing. Theres a t shirt I wanna get it says ......all natural......with a little bit of tren lol