1) Catches by surprise 2) Catches napping 3) Catches off guard 4) Causes alarm 5) Gives a shock or surprise to 6) Makes a loud noise 7) Makes one jump 8) Scares suddenly 9) Surprises 10) Takes by surprise Found on https://www.crosswordclues.com/clue/startles
1) Alarms 2) Jars 3) Spooks