Two steroid users face 10 years in jail for deliberately hiding their syringes in supermarket food so shoppers could find them.
Matthew Keam and Bradley Scott, from Kent, slipped steroid syringes into a cereal box and a carton of orange juice before putting them back on the shelves.
A court also heard the pair put an uncapped needle inside a packet of garlic bread.
The idiot duo also planted syringes in a pair of boots, in a Christmas tree, among clothes, and between bottles of milk.
They struck seven times at Sainsbury's in Aylesford, Kent, between July and December last year.
Keam, from Maidstone, and Scott, from Gillingham, admitted contaminating food at Sevenoaks Magistrates Court on Friday.
The pair will be sentenced at Maidstone Crown Court at a later date, due to the severity of their offences.
Prosecutor Anna Kachingwe said: "Both Mr Scott and Mr Keam attended a body building gym and both injected steroids as part of their training regime.
"Mr Scott admitted all seven offences when interviewed by police.
"He said there was no other reason for them apart from “just plain stupidity”.
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"He had not targeted Sainsbury's for any particular reason - it was just near the gym."
Toby Burrough, defending Mr Keam said: "The needles had caps on them, it was not going to hurt anyone.
"The sole intention was they were looking for the shock value - 'wouldn't it be funny if someone saw that in there.'
"There was no intention to cause harm or blackmail the store."