ijjysmith
Calm
That's the most recent, but the loads of other examples.
WWE basically fired Kurt Angle in 2006 for having a drug addiction and refusing to go to rehab, yet TNA signed him straight away as soon as he was released and put him on their tv. He wrestles on TNA's shows (he's been in rehab and has had several DUIs since), but his contract is up in August and he's probably leaving the promotion, looking to return to WWE. However, like Hogan, he is unlikely to pass the WWE medical to ever wrestle in WWE again. The standards are so much higher in WWE.
Didn't know that about Angle - be utterly boss having him back in any role at WWE. One of my all time faves.