Originally from a New Line Cinema auction in 1999, this prop was also featured on ScreenUsed.com:
“Fat Bastard's Stool Sample Beaker and hotplate/platform used by Austin Powers when he mistakes the stool sample for coffee and takes a drink, leaving a brown colored mustache on his face. The beaker is made of glass and has the ‘Fat Bastard Stool Sample’ label attached to one side (The second label was removed after filming was complete). The hotplate is a metal mesh with a burned residue remaining in the center and the stand is metal with an open bottom to allow the stool sample to boil over a flame during filming.”
After a swig of what he thinks is merely bad coffee, Austin naively comments, “It’s a bit nutty.”