gwar uses shocking imagery and lyrics and toilet humor to get a higher unspoken point across. where as bevis and butthead were just pure toilet humor with no point what so ever but to make hordes of grunge-listening teenagers laugh at fart jokes. aside from links between the 2, the b&b video games featured gwar for example, and gwar may have done the theme song for the show (ive never bothered to research this fact and it may be completely bogus). but other than that its like comparing apples and oranges. south park is actually a better parallel to what gwar is about, its shocking, gross, etc, but it usually has a moral behind the plot.