All exceptional ideas men! Unfortunately for me, we are in a dirty, greasy, old maintenance shop. I'm a machinist, he's a mechanic. Dust from wire drawing lubricants tends to collect on the grills of the large fans we use to cool the shop. He "spritzed" some water into one and got me and another coworker on the other side of a wall. I paid him back by throwing an empty plastic Gatorade bottle against the grill of a fan pointed directly at him. Seeing as he was very sweaty from the day's work, the black dust stuck very well to him. Kinda looked like Al Jolson, heh-heh! Well, I knew he'd not let bygones be bygones after this. He's a cagey ol' codger around 56-57 years old who has mucho experience with pulling pranks on coworkers.
I'm still a young-un at 39!
Sure enough, he disappeared just before time to leave and I knew he was gonna try something. I was on the lookout as I exited the building, carefully approaching all the corners and doorways. There was one place I failed to check though. I made about 4-5 paces out of the breezeway toward the parking lot, when the skies opened up!
That old bastard had climbed up on the roof of the plant (mill) and dumped a gallon bucket of water on my head! I was Soooooo pissed at myself for getting caught so easy!
Keep the ideas coming! I appreciate the assistance!