Peppy was my first twitterbot, and is my favorite. All my others have been shut down since twitter changed their TOS. The bot just tweets a random quote of Peppy from StarFox 64 once an hour. I had to update the bot when twitter switched to oauth only, but the benefit to that is that now the twitter client shows up as Great Fox. The whole things is just a simple Python script, and runs as a cron job on my server.
I was just curious and put together some data for how to spell "shit" the way Clay Davis from The Wire pronounces it. I also made a twitter bot just like Peppy that tweets "shit" with a random number of e's.
This started out as a joke with one of my friends, but turned into a fun little project. A python scipt runs every half an hour and uses the twitter api to download any recent tweets by comic creator Rob Liefeld. It figures out how many exclamation points he used, and then writes it all out to a database. I then wrote a simple php page (my first in many years) to pull the info from the database and display it. I used Google's Chart API for the graphs, which I am now a really big fan of.