Sonic Screwdriver
"I don't think that thing is actually a screwdriver." Rose leaned down from where she sat on the floor.
"Really?" the Doctor said, continuing to use his sonic screwdriver to repair a part in the underbelly of the TARDIS.
Rose let out a snort of laughter. "That 'screwdriver',"—here Rose made air quotes—"can open any door, made my phone intergalactic, can be used as a weapon in a pinch…is there anything it can't do?"
"Well," the Doctor said, pausing in his work, "There is one thing it can't do." He looked up.
Rose leaned closer. "What?"
"Tighten screws."
The sonic screwdriver is to the Doctor as the multi-tool is to Survivorman. If you've never watched Survivorman, that made no sense, but if you have, you're laughing right now.