Harnisch was a crazy dude? He always seemed like a pretty determined competitor to me. What sort of stories (if they can be shared)?
It was mainly just little things that made people laugh. Plus, since my sister was one of the few women that was around the club house (she ran media and game notes around among other things and set up player interviews) she was a particular target. Whenever he came across her talking to a group of people he'd run up to her and either introduce himself as her fiance or ask her when she was going to accept his proposal. Other things...
1) He was certain that the miniature blimp they had in the Dome was full of candy and he threw baseballs at it to see if he could break it open pinata style.
2) Scott Servais one took a fastball off his cup and while he was in the training room moaning in pain Pete pulled my sister in yelling, "Dude, look at Scott's nads! They're all black and blue!"
3) Pete and Luis Gonzalez (a frequent target of his) were once eating a bag of mini Tootsie Rolls they had taken from the buffet spread and he said that they "Looked like little dookies" which caused Luis to start laughing and spew brown Tootsie Roll saliva everywhere.
There also a story (possibly true, possibly not) that Luis and Pete were on the road and got into an argument over what to watch on TV in their hotel room. It ended up with Pete dangling Luis over the balcony rail (not all the way like on TV, but enough) and yelling that they were going to watch whatever it was (possibly Cartoon Network) and Luis crying and yelling at him to pull him back up.
That's just the stuff my sister thought was safe to tell me at the time. From what I hear, he was a riot to be around.