Ex-con “Pharma Bro” Martin Shkreli offered some jailhouse wisdom to alleged crypto conman Sam Bankman-Fried if he ends up going to prison: Shave your head and brush up on rap lyrics.

Shkreli, who served five years in federal prison after being convicted of securities fraud in 2017, said Bankman-Fried needs to change his appearance if he is to survive being locked up.

To do that, Shkreli suggested the 30-year-old fallen crypto whiz kid shave off his wild hair and deepen his voice to fit into the “very testosterone-filled, masculine place.”

“Sam is going to have a lot of issues because he is a bit of an effeminate guy and his demeanor — some people say autistic sort of sense, or sensibility — is not something that goes over well in prison.” Shkreli said in an interview Friday with cryptocurrency journalist Laura Shin.

Bankman-Fried was released on $250M bail as he awaits trial on fraud charges. If convicted, he faces up to 115 years in prison.

“He should be listening to as much rap music as possible… pick those things up as quickly as he can,” Shkreli said on the Shin’s podcast “Unchained.”

If Bankman-Fried preps on topics including “criminal culture” it could “save your life,” Shkreli added.

“Learn everything there is to know about gangs, about the tough neighborhoods in every city,” he said

Shkreli, who was sprung from prison in May, rose to notoriety after he hiked the price of life-saving AIDS treatment Daraprim to $750 a pill from $17.50 after obtaining the exclusive rights to it in 2015.