Here are a few we have done over the years. You may already have them since I don't know if we thought of them initially or saw something that gave us the idea.
1. There was a guy my wife liked, but in a vanilla setting, so she was unsure how to bring up our lifestyle. We had returned from a trip to Napa Valley, and she was showing him trip pictures on her phone of things like wineries, landscapes, vineyards, the Golden Gate Bridge, and some small towns we had visited. She was sitting next to him at a restaurant as he was scrolling through the images on her phone. Mixed in were four very graphic pictures of my wife during sex with other men. The guy's eyes got as big as his plate each time he saw one of the pictures, and my wife would blush and remark she didn't know that was in there. She would tell him how she met the guy and how he was charming, and I must have taken the picture using her phone.
2. The pizza delivery challenge. We haven't ordered food at home, but we have ordered room service at hotels several times and put different variations on the challenge. The first time, we were at a five-star hotel in a large suite, and I ordered a bottle of Dom Perignon along with a fresh fruit and cheese tray, asking for service for three. At this hotel, they do the entire in-room service with your own personal waiter. The waiter showed up formally, and I was dressed in a suit and invited him in to set up our service. As we walked into the room, the guy's eyes were drawn to the bed where my wife was ass up getting hammered by a young stud we had met the night before. I casually told the waiter, "We can go ahead and get set up, my wife will join us shortly with her friend."
3. We went out to a dance club while visiting Nashville, TN, one evening and staying at the Courtyard Marriott Downtown. My wife held my hand as we moved around the club, and she flirted with young men who caught her eye. She actually had a very intense makeout session with one guy beside the dance floor as I stood at her side. She danced with a few guys and let one of the guys get her tits out of her dress and play with her nipples before she pulled the dress back up to cover herself. After about an hour and a half, she asked one of the guys if he wanted to go to our hotel room for some fun. She returned with the guy about an hour later with her hair and makeup disheveled and panties wet from his cum load leaking from her used pussy. She kissed me and told me to thank the guy for satisfying my wife so well for me.