Crap. No, crab, I meant craB!

Another example why having bad hearing is not conducive to learning a foreign language:

Instructor: Bpõo
Me: (writing and muttering) bpõo
Me: (quizzical look)
Instructor: Crab
Me: (Incredulous) Crap?
Instructor: Chai. Crab.
Me (thinking: he just said crap!)
Instructor: bpõosidam
Me (really hung up on the fact that he said "crap"): bpõo. I'm going to remember this one!
Instructor: You like crab?
Me: Huh?