Telephone!
Now that's truly funny!!! Because it will probably happen! To me!
Caller: Is this the Manic Mechanic?
Yes...Uh maybe...wait, no I'm...I mean he's busy.
Caller: I have a quick question about muffler bearings...can you help?
Yes...muffler bearings are obsolete...the new hot ticket is to keep the muffler stationary.
Caller: Are you sure?
Positive...a few tried it and it didn't work out so well...your fixed muffler will work fine.
Jim