Car alarms and open doors.....

 And then shall they see the Son of man coming in the clouds with great power and glory.

27 And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.

28 Now learn a parable of the fig tree; When her branch is yet tender, and putteth forth leaves, ye know that summer is near:

29 So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors.

30 Verily I say unto you, that this generation shall not pass, till all these things be done.

31 Heaven and earth shall pass away: but my words shall not pass away.

32 But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father.

33 Take ye heed, watch and pray: for ye know not when the time is.

34 For the Son of Man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch.

35 Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:

36 Lest coming suddenly he find you sleeping.

37 And what I say unto you I say unto all, Watch.