Heh. I just made up random crap most of the time.
Wolfgang's current greeting is "Gimme a pizza", which makes lots of conversations more amusing. His catchphrase has changed many a time; it's been "spengey", "tacos", "I'm fluffy", "flih", and the list goes on.
Harry's catchphrase, before he left, was this:
Samson's greetings and catchphrases used to have a TF2 theme. At one point his catchphrase was "pootis POW"; then at another point it was "sandviches".
Agent S' catchphrase was "herp derp" at first, which was the same catchphrase I gave her in Wild World. Somewhere along the line it was "I will eat you", based off of Painis Cupcake (TF2-inspired character, look it up on YouTube).
Gabi's is "I need to move". Can you guess why?
Finally, using the power to change Kitt's greeting, I got this heartwarming dialogue a couple days before she moved away: