Client: I'm not sure who is going to evacuate my dog today, you or the vet.
Me: Silence...I'm thinking, does he mean vaccinate?
Client: I just want to make sure someone evacuates her anal glands, she has had problems with them in the past.
Me: (trying not to react) The vet will probably take care of that for you today.
I am quite proud of myself for keeping a straight face during this exchange.