 embarrassment is appropriate. There's that famous saying, if you're not embarrassed by your prototype, you showed it too late. If you are only going to do experiments which get positive results, you're not really experimenting. You're doing what you already know. And this is one of those situational questions. Are we now running the business or are we changing the business? You don't want to look silly. You don't want to look stupid. Thinking the rest of being embarrassed is probably holding you back.