Bonnie, Dawn and Glyn are the first three Big Brother housemates to be nominated for eviction from the seventh series of the Channel 4 reality show.
Bonnie calls herself a "geezer bird"
Bonnie, 19, a care worker from Loughborough, is the bookmakers' favourite to go on Friday, at 1/3.
Dawn, 38, from Birmingham, an "exercise scientist", threatened to walk out when her name was read out.
Welsh lifeguard Glyn, 18, was upset when told they would not get their suitcases back until they left.
On Tuesday night, contestant Shahbaz Chauhdry walked off the show.
The 37-year-old Glaswegian was being monitored by the show's psychologists after threatening to kill himself during his five days in the house.
Dawn says she has no friends
"I am a dead man walking. This is my last curtain call," he told housemates.
In a statement, Channel 4 said: "He was unhappy and finding it increasingly difficult to integrate within the group dynamic of this year's housemates."
This year's Big Brother began on Thursday and has an "inside out" theme, with sofas in the garden and grass indoors.
The house is smaller than in previous years, with greater use of mirrors and glass to give contestants as little privacy as possible.