A couple of fun apps that I would like to share with you all
Network Spoofer (Favourite)This is my favourite for pissing other people off. With this application you can either select an individual wifi user or choose to hit all wifi users, once you have made your choice you can blur all images, replace all images (with a custom image or the default troll face), redirect all of their webpages to kittenwars (or a custom site of your choice) you may also choose to redirect all YouTube videos to a rick roll.
There are a few other neat things you can do.
Homepage:
http://digitalsquid.co.uk/netspoof/
zImperium (Professional)This application does cost however it's capable of dishing out MITM attacks as well as delivering remote exploits, but the way this application works you have to buy credits and each credit is one hack. I haven't tested this much but it's still worth a look.
Homepage:
http://www.zantiapp.com/anti.html
LanDroid (Free and Useful)This isn't as fun as the previous two but it is packed full of features for gaining useful information about the network and also comes in handy when trying to diagnose your own network problems if your having any.
Homepage:
https://play.google.com/store/apps/details?id=net.fidanov.landroid&hl=enAnyway, I hope these help and make your boring Starbucks visits worth while