Alien guy is totally underused. This script changes that. It also supports others, but that's boring...

memes.sh

#!/bin/bash
# Yeah, it's a hack. Deal with it.
# template ids are here: https://api.imgflip.com/get_memes
# Usage:
# memes.sh <bottom text>
# memes.sh -t <top text> -m <template id> <bottom text>
TEMPLATE_ID=101470
TOP_TEXT=
BOTTOM_TEXT=
while test $# != 0
do
    case "$1" in
    -t) shift; TOP_TEXT=$1 ;;
    -m) shift; TEMPLATE_ID=$1 ;;
    *) BOTTOM_TEXT=$1 ;;
    esac
    shift
done
echo "Building meme..."
if [ 101470 != "$TEMPLATE_ID" ]; then echo " using id: $TEMPLATE_ID"; fi
if [ -n "$TOP_TEXT" ]; then 
  echo " with top text: $TOP_TEXT "
  TT_ENCODED=`node -e 'console.log(encodeURIComponent(process.argv[1]))' "$TOP_TEXT"`
  TT_URL="&text0=$TT_ENCODED"
fi
if [ -n "$BOTTOM_TEXT" ]; then
  echo " with bottom text: $BOTTOM_TEXT "
  BT_ENCODED=`node -e 'console.log(encodeURIComponent(process.argv[1]))' "$BOTTOM_TEXT"`
  BT_URL="&text1=$BT_ENCODED"
fi
TEMPLATE_URL="template_id=$TEMPLATE_ID" # Has to be first
BODY_URL="$TEMPLATE_URL&username=imgflip_hubot&password=imgflip_hubot$TT_URL$BT_URL"
JSON=`wget --quiet \
  --method POST \
  --header 'content-type: application/x-www-form-urlencoded' \
  --header 'cache-control: no-cache' \
  --body-data $BODY_URL \
  --output-document \
  - http://api.imgflip.com/caption_image`
#echo "oops:$JSON"
URL=`node -e "console.log(JSON.parse(process.argv[1]).data.url)" $JSON`
echo "Trying to open pening $URL..."
if [ ! -x "$(command -v xdg-open)" ]; then
  xdg-open $URL &> /dev/null
else
  open -n $URL
fi