A weekend parachutist leaped out on his first jump of the day. Nothing happened when he yanked his ripcord. Unperturbed, he began feeling around for his backup cord......patting.....groping..... Just then, as he looked toward the ground he saw a man coming upward at a high rate of speed. He knew as they passed going opposite directions he wouldn't have time for much dialog. He shouted, "Do you know anything about parachutes?" "No" shouts the other guy "Do you know anything about acetylene tanks?"