Remember the point of terrorism is to terrorise you. If allow yourself to be scared they win. The best way to handle terrorism is to trivalise it by laughing.
I have German friends who play Nazi Zombies on Call Of Duty and they think it's the coolest thing ever! When i asked if they found it offensive they laughed at me. Then pointed out they can see the funny side of it but maybe their grandparents would not see the funny side of it.