Right-on! These scenarios are sadly straight out of real day-to-day life in a successful business.
The colleague one is classic, or worse yet, you're called by the 'expert' himself who trivializes your product yet somehow is calling to buy it.
Top of my list though is this: Customer negotiates again after delivery. "I want a refund unless I get convoluted feature X for free, or $Y off the price."
Don't be afraid to fire a customer just to improve your quality of life. Bonus points for describing your direct competitor as a perfect fit.
Finally, for sanity's sake, never give out your personal cellphone number. If you must be "reachable," use something you can block off-hours.
The colleague one is classic, or worse yet, you're called by the 'expert' himself who trivializes your product yet somehow is calling to buy it.
Top of my list though is this: Customer negotiates again after delivery. "I want a refund unless I get convoluted feature X for free, or $Y off the price."
Don't be afraid to fire a customer just to improve your quality of life. Bonus points for describing your direct competitor as a perfect fit.
Finally, for sanity's sake, never give out your personal cellphone number. If you must be "reachable," use something you can block off-hours.