Weird script 1

#!/bin/bash
# Weird bash magic from japanese twitters
# shellcheck disable=SC1090
original(){
. /???/??/$?<<<.\ /???/??/$?\<\<\<\$\'\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$/$$<<$$/$$<<$$/$$))\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$/$$))\\$(($$/$$<<($$/$$<<$$/$$<<$$/$$)))$(($$/$$<<$$/$$<<$$/$$))\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$$?/$$/($$/$$<<$$/$$)))\'
}

breakdown(){
# 1)
# . /???/??/$?<<<
# source /dev/fd/0 (stdin),
# where '???' matches 'dev' and '??' matches 'fd';
# '$?' is previous command status, usually '0' which is why this script doesn't always work

# 2)
# .\ /???/??/$?\<\<\<
# <<< is HERE STRING like << is HERE DOC
# source /dev/fd/0 (stdin) again, but the space is escaped and <<< are escaped as well
# Note: I broke it with \ into three lines as executed in `bash -x`

. /???/??/$?<<<\
.\ /???/??/$?\<\<\<\
\$\'\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$/$$<<$$/$$<<$$/$$))\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$/$$))\\$(($$/$$<<($$/$$<<$$/$$<<$$/$$)))$(($$/$$<<$$/$$<<$$/$$))\\$(($$/$$))$(($$/$$<<$$/$$<<$$/$$))$(($$$?/$$/($$/$$<<$$/$$)))\'

# 3)
cat <<EOF >/dev/null
\$\'
\\$(($$/$$))
$(($$/$$<<$$/$$<<$$/$$))
$(($$/$$<<$$/$$<<$$/$$))
#$'
#\1
#4
#1
\\$(($$/$$))
$(($$/$$<<$$/$$<<$$/$$))
$(($$/$$))
#\1
#4
#4
\\$(($$/$$<<($$/$$<<$$/$$<<$$/$$)))
$(($$/$$<<$$/$$<<$$/$$))
#\16
#4
\\$(($$/$$))
$(($$/$$<<$$/$$<<$$/$$))
$(($$$?/$$/($$/$$<<$$/$$)))
#\1
#4
#5 as 10*pidof/pidof/2
\'
EOF
# $'' works like printf ''
# $$ is pidof script, $(()) is arithmetic evaluation
# $$ divided by $$ is always 1, 1<<1 is (shr/shl) 2, 2<<1 is 4
# after evaluation we get escaped backslashes and digits
# -- that might be an octal representation of some ASCII symbols
# btw, oct '\144\141\164\145' is
# hex '\x64\x61\x74\x65' or
# dec 100,97,116,101 or
# ASCII 'date'

# Conclusion:
# This one-liner sources stdin for two subshells passing octal 'date'
# as long as $? was 0
# printing current local time and date into current terminal.
}

cleanver(){
. /dev/fd/$?<<<.\ /dev/fd/$?\<\<\<$'\144\141\164\145'
}

original
breakdown
cleanver