Went to Denny's at 9310 W. Tropicana Ave., Las Vegas, NV on 2/26/18 and had a bad experience. We received a coffee cup that had red lipstick still on it from previous customer. After I returned the coffee cup it was over 10 minutes until I received another cup of coffee. Then it was another 20 minutes until we received our meals. The manager stated that they had just brewed a new pot of coffee but I am sure you have more than one pot of coffee and it certainly does not take 10 minutes to brew if that was the case. I was also told they were very busy but there were only a few customers and it seemed they spent more time checking out customers than attending to seated customers. Not sure if they are under staffed but these excuses seem very lame to me. I am not going to this Dennys ever again. Sorry but will not be going to this Denny's anymore.