(Prompted by P. 189 of Writing Solid Code by Steve Maquire).
Bugs are not comedians so never refer to a bug as a silly bug.
All bug reports should be treated as dead serious (and eventually given a good burial in the defect tracking system, maybe we could refer to Ross Garmore's area as Tombstone Territory?).
"The real question isn't whether the bug is silly but why the programmer who tested the code didn't catch the bug. Even if the bug is minor and not worth fixing, it's still important to determine its cause so that you can prevent similar bugs in the future.
"A bug may be minor; that it exists is serious."