We went to the local park (he's only 15 weeks old so we were out for 25 mins, max), came home, washed muddy paws in warm water in the garden, came in and dried paws and body then he went absolutely loopy. 
He is restricted to the back of the house which is open plan kitchen, lounge and dining area and he just ran like a mad man all around, jumping on and off the sofas, under the table, throwing himself at a bag that I have hanging in th kitchen. Eventually he stopped as he saw I had the treat bag in my hand and I coerced him into his crate.
He does have loopy turns most days but this one just seemed more full on than usual.
TIA