May stem from the relationship between the March hare and the Mad hatter in
Lewis Carols - Alice in Wonderland during the tea
party.
See also: Mad As a Hatter
1) Jimbo took three E's a
tab of acid a hefty snort of
coke, a massive toke on the bong and for the rest of the
evening was seen to be acting as mad as a March hare.
2) My grandadsd is 99 and sometimes acts as mad as a March hare.