I've always thought the Probie character and the Garrity character were pretty interchangable. With the only thing unique to Probie was that he was a probie.

I've been sick of Probie since last season when he went psycho on the fat chick.

paraphrasing a bit:

Probie: From the look of his clothes this guy must be loaded.
Franco: A-hole, he's a hansom cab driver.
Probie: Well he aint so handsome now.

I don't know. Sure he's always been a bit slow and naive, but I think that was a little over the top stupid

About 3 years ago in December, after a night of drinking I had an argument with my cousin and his best friend over their ages. My cousins and my siblings are all 2 years apart so it is easy for me to figure how old one of the other 5 are. I turned 30 that year so he turned 32 in October. The two of them swore they would turn 32 the following year, they even tried to do drunk math from their drivers license. So I did not find it too over the top, as I think my cousin and his friend are a lot smarter than the probie.

key phrase
I don't think probie had been drinking