Oh, so many:
Kawasaki? What "size" is it?
Is it fast?
Well, duh!
What's the fastest you've ridden?
None of your business!
Nice bike is always nice to hear.
Recently had a young lady in the passenger seat outside the store tell me she liked, really liked my bike. Was about to ask if she had a helmet and exchange digits. Then her boyfriend, or whatever, came out. It's OK, my wife would have been furious! :-)
Of course, depending on the season.
Ain't it hot? A bit cold for that ain't it?