For centuries, on the first of April people have pranked one another just for the lolz.
There is this unspoken idea that if you participate in it you will be mocked and trolled and pranked.
"a ludicrous trick" [Johnson], 1520s, of uncertain origin, perhaps related to obsolete verb prank "decorate, dress up" (mid-15c.), related to Middle Low German prank "display" (cf. also Dutch pronken, German prunken "to make a show, to strut"). The verb in the modern sense also is from 1520s. Related: Pranked; pranking.