Watching the bikes is the easy part. Making sure nobody rides off with one is the hard part. Dealing with the owners is the really tricky part.
"You say your name is Tim and you go by the handle TWN? Okay. How come your wrist band doesn't match the I.D. I have of the bike you are trying to ride, sir? Please come with me and speak with this nice gentleman in the uniform......Oh, and Tim, please watch your head as you sit in the backseat of the car....."
"What's that, sir? Your friend Rad is riding your bike and this is his? Well sir, who is this Rad and what does he look like? Why, yes sir, that back seat will hold 2 people. No holding hands, though!"
"Oh Tim, you devil, you! Now you'd like to be cuffed to your friend?!?!"
"Why, no sir, I wouldn't think of posting this difference of opinion."