DH said he did that the other day - was out of town and checking out of his hotel. Went to grab his laptop bag, could not find it anywhere in his hotel room. Started panicking, thinking someone had stolen it and he was going to miss his flight - until he realized it was slung over his shoulder, all 15 pounds of it!
I had a doozy about a year ago. I have a little Brother my DH gave me about 7 years ago. Now keep in mind I've sewed EVERY DAY on this machine for 6 years. Took the bobbin out to wind it, cleaned it out while I was at it, blew the dust, oiled it, blah blah blah. Went to put the bobbin back in and could not find the bobbin case. Looked and looked and looked for about 2 weeks! Finally realized that machine DOES NOT HAVE A BOBBIN CASE. It's a drop-in bobbin.