Custer had an Irish scout, who'd been sent out ahead and to return as soon as he seen any hostile Indians, well after three days he returned to camp for supplies and reported he'd seen no hostile Indians, then suddenly 8,000 of them swooped down and wiped them all out, except for Custer, his horse and Paddy the scout..
Custer turned to Paddy and said "I thought you said there were no hostile Indians out there" and Paddy replied "well, when I seen them, they were singing and dancing".