The 1975 frontman joined BBC Radio 1 presenter Nick Grimshaw for his breakfast show on Wednesday (26Mar14) and took part in the Call or Delete game, which involves guests prank-calling someone famous in their phonebook.
After failing to get through to Niall Horan, Healy rang Styles and told him he urgently needed to borrow some money to get him out of a sticky situation.
Healy said to Styles, "Basically I need five grand (£5,000) I'm in Chalk Farm (north London) and I'm having an emergency... it's actually quite a serious situation. I've got two guys in here in a phonebox with me, one of them just keeps pointing at a photo of (Take That singer) Mark Owen, it's really weird I don't know what that means, and it's really threatening. Do you reckon you could get Niall to come down and sort me the cash?"
Styles did not realise the call was a prank and agreed to arrange the loan for Healy, saying, "Ok, well we're in Bristol (England). But let me go and I'll get my assistant to call you and she'll sort it out."