so what is really going on when you stay at a hotel? How do you get free stuff, good service and avoid that smelly room by the elevator? He's going to join us live but first abc's chris cuomo takes us... See More
so what is really going on when you stay at a hotel? How do you get free stuff, good service and avoid that smelly room by the elevator? He's going to join us live but first abc's chris cuomo takes us behind the scenes. Reporter: Looks like a carjacking, doesn't it? But it's actually a hotel parking in st. Louis posted on youtube. The valet parker probably got hired last week. Probably gets fired next week. Doesn't care that much. Reporter: Jacob thompson worked his way from valet to desk manager. Now to his book "heads and beds" he reveals the much coveted secrets of the hotel rooms. Is I there's a revenge from the staff? Without a doubt. There's a thousand ways that i can get back to you. You yell at your daughter in a way I don't like. Reporter: You'll do it with a straight face? Absolutely. Reporter: Thompson said it's a myth that hotel maids steal your stuff, but that doesn't mean they won't look through. The bag's on the bed. In fact, it's possible for them to go through. That's why I would recommend them using the hotel safe. Reporter: But "safe" is a relative term. Into the safe and out goes the cash. Next, we head to the bathroom where he reveals another secret. It's covered, all right? That's exactly what they want. Oftentimes, these are clean, which is going to be shampoo -- Reporter: You're saying it's not like these were in the dishwasher? No, these are staying in and they're going to be cleaned in here. Jacob thompson joins us now with groans. Is that really true? Yeah, I worked in housekeeping for quite a while. Either that or shampoo in the sink, you fill it up with hot water and put the shampoo in there. What made you do a book here? I guess that would do it? Ten years in the business, i saw and heard it all with crazy stories from guests I thought I'd write a book to encapsulate that with tips and tricks. One of the complaints you have is about who to tip? You should tip all. The front desk. They're the gods of instant karma. I could make or break your stay. A little bit of kindness, I can get you upgraded. How do you know if the person at the front desk will be open to that? Well, I don't think tipping ever looking bad. It's a wonderful thing to do. I don't think anyone is going to be offended. If they are, they'll tell you. What has been the reaction that you got from the hotel industry since this all started? Actually, it's been positive. I did my best to explain all the workings and humanize what we do and how we do it, to stay maximized. As far as upper management, we'll see how that rolls. Jacob, thanks for being here. It's a pleasure to be here. Coming up, how to d
This transcript has been automatically generated and may not be 100% accurate.