Yes; believe it or not, the pie WOULD work. Darkseid's Omega Beams are (like Kryptonian heat vision) eyesight-dependent - no eyesight, no Omega Beams. Sort of a SHAME there are no pies to be discovered in "Darkseid's War Factory" (8-character raid in DC Universe Online) - or could that be WHY there's a distinct lack of slapstick? Slapstick may SOUND stupid; however, if it works, it's not stupid - and blinding someone shooting at you isn't stupid - far from it.