Watch a foreign tv ad Watching tv commercials helps develop listening skills in a foreign language. Short, repeatable & visual, you'll be surprised how much you pick up.
Breathe deeply outdoors Meditation may not be for everyone, but stepping outside to breathe in fresh air provides distance & clarity while calming the nerves. Deep, "calm" or "slow" breathing is also said to help sufferers of anxiety.
Draw, doodle, color Get into the zone or flow by starting or continuing a sketch. If you're not artistically-inclined, try doodling or an adult coloring book, which are touted as having a meditative effect. At the very least, you'll have some pressure-free fun.