I dunno, I always spell it 'whacky'.

( Esme Weatherwax I swear on my tash it's daycent hash, Thu 4 Jun 2009, 11:02, archived)

For me,
that way has more connotations of slapstick.
( Moon Girl Technologies horrendous beanbag, Thu 4 Jun 2009, 11:04, archived)

Yeah, wacky looks unfinished.

( Esme Weatherwax I swear on my tash it's daycent hash, Thu 4 Jun 2009, 11:06, archived)

"Whacky" makes me think you go around "whacking" people,
like out of open windows with a plank of wood and stuff.
( Moon Girl Technologies horrendous beanbag, Thu 4 Jun 2009, 11:09, archived)