The word game
I'm sure this has been mentioned by many people but working in a tech centre and the challenge was to get various words into the conversation.

This usually started with mundane words such as lemon, dog and escalope but eventually worked up to more suggestive words like moist and chafe...

Oh yeah, and seeing how many pints we could drink in our 30min lunch at the pub over the road and still being able to function in the afternoon
(Fuckarma was masturbating into your handbag, Mon 12 Jan 2009, 10:35, 2 replies)

Octopus Prime
I worked in a call centre for a company that sold waterbutts and compost bins.

I won a toffee crisp once for working the words "Octopus Prime" into a call to a customer who was complaining about a delivery problem. This was around the time that the Transformers film was out, but it was thought that "Optimus" was too normal sounding.
(herefromthere, Mon 12 Jan 2009, 17:15, closed)

word game
We used to play this in the bank (on quiet days). Basically, there was only one customer being served, and the other 4 people were listening in to the conversation just waiting for "the word" to be added in. I think it was quite obvious to the customer, because as soon as it was mentioned, we all either started going red and had our hands over our mouths, or else we ducked our heads under the desks...
(DTBrush, Mon 12 Jan 2009, 21:59, closed)