What Causes High Mood Swings?

Is there a condition that manifests as occasional bursts of manic-like behavior, i.e., rapid fire talking, extreme jumping from one thing to another unrelated, extreme distractability, . My husband does this, especially when driving or going somewhere new. If he has a couple of drinks, it s worse, although it doesn t happen everytime he drinks. Talking so fast, not really listening to my responses, it s almost as if I m not there, he s so busy commenting on things he sees, it s almost like he can t get the words out fast enough. Always in a good mood , or high when this happens. Any thoughts? I can t figure it out.