1/clinging (if the experience is pleasant),
or
2/judging, controlling or expecting it to be a certain way (if it is unpleasant)
or
3/feeling bored, vague, confused or not knowing what is happening (if it is neither pleasant nor unpleasant).
L= LET IT BE & LIFT: Let it be: allow that experience to take its own course, accepting it the way it is. "Lift" the energy by simply becoming interested in what is happening in order to understand its true nature.
M= MIND your own business: Mindfully observe life as it unfolds (within your body and mind), moment by moment. Establish Mindfulness within any of the Four Foundations (Body, Feeling tones, Mind and Phenomena, perhaps the most predominant experience in that moment). Leave conceptual reality in the background and focus on the ultimate reality ("hearing" instead of "birds chirping", "pressure, heat or unpleasantness" instead of "my back hurts", "sadness manifesting" instead of "I am sad"...), notice what happens to it (how it arises, changes and passes). Adopt the skillful attitude of having a joyous interest, relaxed yet alert, non-judging, non-expecting mind. Mind your own business by focusing on watching the fire of emotion in your own mind/body (reality that can be directly explored: "Anger") rather than adding fuel to it by revisiting the external circumstance that started it (memory: past experience, concept: "He makes me angry") or getting lost in what to do/what will happen (projection: future, concept: "I need to get even").
Use METTA (Loving-kindness) as a complementary practice as needed.