I personally love it when I spend a half hour looking for a particular tool...usually a socket...and then it turns out I was holding it in my hand all that time.
Turned the corner down the street, heard an awfull rattling noise that went away fast. Came back and the nieghbor was standing at the head of his driveway laughing holding a 3/8 comb. wrench, just had finished tighting my headers before I left. SHEESH.