High Priority Low Severity Bug:-

Home Page in web application has misspelled client name and 
found at the time of delivering the product.


High Severity & Low Priority :

Suppose there is an application which generates some 
banking related reports weekly, monthly, quarterly & yearly 
by doing some calculations. In this application, there is a 
fault while calculating yearly report. This is a high 
severity fault but low priority because this fault can be 
fixed in the next release as a change request.

IF ANY website for example yahoo spell is yaho here spell 
mistake so we have to give the quick priority.becuse it 
will affect the site name. so we have to give the quick 
priority. But low seveority.because due to spell mistake 
not affects the application. So here we can give low 
severity.