Paintballing involves firing balls of paint at friends, siblings, work colleagues or complete strangers. It is an invigorating way of relieving stress, hilarious fun and appeals to all ages. Paintballing is good for any celebration that calls for childlike tomfoolery. Most centres are on the outskirts of the city or further afield, so make sure you check the location before booking with a company that claims to be ‘in Barcelona’.