Here's text of what I gave to my boss at two different jobs...quite effective...
The date has arrived that I must now give you this notice. Due to unresolved problems with various sources of irritation to me, I have arranged that, effective 2 weeks from above date, that I return to my prior position at my former employer, xxxxxxxx.
I wish that we could have come to a better resolution of salary and title issues, and am leaving open the door for possible further negotiations, so this issue may still be resolved without impact on you or the operations of the department.
I have enjoyed working with the staff here, and have found pleasure in developing certain applications, but feel that my talents have not been rewarded at the appropriate levels compared to others I have worked with in this group.
I am sure that you can understand why I must do this at this time, since this opportunity will only be valid for a limited time, and find this a hard choice to make, but I must have more enjoyment at work than I have had recently, and this will give me that chance.
What i did was DATE the letter either 10 yrs in the PAST or 10 yrs in the future! (1991 became 1981 which was PRIOR to my employment at that job) And put April Fools on very bottom of page...which I folded over so it wasn't seen....then after the panic was at approp level, I told them to read date and last line on page...they thought it was great!
COBOL - Not a dead language yet!