Friend of mine put a motion sensor on his boat lift, wired to the house. No alarm outside, just a warning light and a quiet buzzer near his bed so he could call the cops and the thieves wouldnt know they'd been seen.

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95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k