I don't think they have 5 seconds available to pick from. Remember, this is the station who once had a newsreader read... in the same stuffy nasally voice they all use... "picked her up by the crotch and [guess] like a bowling ball".
My top 5 of WTF callers on 2SM FWIW
1) Jim - 49 years old, rings into the John Laws show sparodically - recently rang in off his face about "them Indonesians, and I don't like them" about a news article that we were going to train 14,000 Singaporeans in Australia. John tried explaining Singapore and Indonesia are not the same, but he just didn't like them as he said. He said he was a patriot, no, you are an ignorant bigot.
2) Bas - this guy rings in in a phoney Lebanese accent (surely, it has to be phoney, its terrible) to Talkin Sport and proclaims his opinion as gospel.
3) Norman - he's ready to get his stab on
4) Sue - oh hoiiii gooouuuyyysss
5) The dude who rings in with the moto GP results that no one cares about
If Gerard Condon wasn't a paid for commentator on their show, I'd add him in too. Pencil neck geek of the highest order.