how about, set tower afire,
catshit 1 has some really good fire effects that u just place on the map, u could make the tower go on fire, and then have the sentry on the top catch on fire, and start screeming and then do setvelocity to make him look like he jummped out, and in the air make him do playmove"commbat to lying" so he dosent hit the ground then get up, then fall down.
just do it like ecp did.